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2)
![- {a}^{4} (7 {a}^{2} + 3) + 7 {a}^{6} = - 7 {a}^{4 + 2} - 3 {a}^{4} + 7 {a}^{6} = - 7 {a}^{6} - 3 {a}^{4} + 7 {a}^{6} = - 3 {a}^{4} - {a}^{4} (7 {a}^{2} + 3) + 7 {a}^{6} = - 7 {a}^{4 + 2} - 3 {a}^{4} + 7 {a}^{6} = - 7 {a}^{6} - 3 {a}^{4} + 7 {a}^{6} = - 3 {a}^{4}](https://tex.z-dn.net/?f=+-++%7Ba%7D%5E%7B4%7D+%287+%7Ba%7D%5E%7B2%7D++%2B+3%29+%2B+7+%7Ba%7D%5E%7B6%7D++%3D++-+7+%7Ba%7D%5E%7B4+%2B+2%7D+++-+3+%7Ba%7D%5E%7B4%7D++%2B+7+%7Ba%7D%5E%7B6%7D++%3D++-+7+%7Ba%7D%5E%7B6%7D+++-+3+%7Ba%7D%5E%7B4%7D++%2B+7+%7Ba%7D%5E%7B6%7D+%3D+++-+3+%7Ba%7D%5E%7B4%7D++)
При a = -1/2:
![- 3 {a}^{4} = - 3 times ( frac{1}{2} )^{4} = - 3 times frac{1}{16} = - frac{3}{16} - 3 {a}^{4} = - 3 times ( frac{1}{2} )^{4} = - 3 times frac{1}{16} = - frac{3}{16}](https://tex.z-dn.net/?f=+-+3+%7Ba%7D%5E%7B4%7D++%3D++-+3+times+%28+frac%7B1%7D%7B2%7D+%29%5E%7B4%7D++%3D++-+3+times++frac%7B1%7D%7B16%7D++%3D++-++frac%7B3%7D%7B16%7D+)
6)
![frac{2x + 3}{2} = frac{3x - 4}{4} - 5 \ frac{10(2x + 3)}{20} = frac{5(3x - 4)}{20} - frac{100}{20} \ 10(2x + 3) = 5(3x - 4) - 100 \ 20x + 30 = 15x - 20 - 100 \ 20x - 15x = - 20 - 100 - 30 \ 5x = - 150 \ x = - 30 frac{2x + 3}{2} = frac{3x - 4}{4} - 5 \ frac{10(2x + 3)}{20} = frac{5(3x - 4)}{20} - frac{100}{20} \ 10(2x + 3) = 5(3x - 4) - 100 \ 20x + 30 = 15x - 20 - 100 \ 20x - 15x = - 20 - 100 - 30 \ 5x = - 150 \ x = - 30](https://tex.z-dn.net/?f=+frac%7B2x+%2B+3%7D%7B2%7D++%3D++frac%7B3x+-+4%7D%7B4%7D++-+5+%5C++frac%7B10%282x+%2B+3%29%7D%7B20%7D++%3D++frac%7B5%283x+-+4%29%7D%7B20%7D++-++frac%7B100%7D%7B20%7D++%5C+10%282x+%2B+3%29+%3D+5%283x+-+4%29+-+100+%5C+20x+%2B+30+%3D+15x+-+20+-+100+%5C+20x+-+15x+%3D++-+20+-+100+-+30+%5C+5x+%3D++-+150+%5C+x+%3D++-+30)
При a = -1/2:
6)
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