Question

Решите уравнения:
1)5х = 15
2)3х + 8 = 10 - 4х
3) 0,125х = 131/8
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Answer 1

1)

$5x = 15 \\ x = 15 \div 5 \\ x = 3$

2)

$3x + 8 = 10 - 4x \\ 3x + 4x = 10 - 8 \\ 7x = 2 \\ x = \frac{2}{7}$

3)

$0.125x = \frac{131}{8} \\ \frac{1}{8} x = \frac{131}{8} \\ x = \frac{131}{8} \div \frac{1}{8} \\ x = 131$