Question

решите уравнения, пожалуйста 2)номер

Answer 1

а) 20 + 4(2x - 5) = 14x + 12
20 + 8x - 20 = 14x + 12
8x = 14x + 12
6x = -12
x = -2

б) 15x - 1 = 3(7x - 1) - 2
15x - 1 = 21x - 3 - 2
15x = 21x - 3 - 2 +1
6x = 3 + 2 - 1
x = $frac{4}{6}$
x = $frac{2}{3}$

в) -8(11 - 2x) + 40 = 3(5x - 4)
-88 + 16x + 40 = 15x - 12
-48 + 16x = 15x - 12
16x - 15x = -12 + 48
x = 36

г) 2x - 12(3 - x) = 1 + 3(x + 2)
2x - 36 - 12x = 1 + 3x + 6
-36 - 10x = 3x + 7
-10x - 3x = 7 + 36
-13x = 40
x = $- frac{13}{40}$
x = 3.25