Question

Решите уравнения. 12x - 7x = 30, 6,5x - 12 = 4,5 8

Answer 1

1)12x-7x=30
5x=30
x=6
2)6,5x-12=4,58
6,5x=12+4,58=16,58
x=2.55

Answer 2

$1)12x-7x=30\\5x=30\\x=6\\\\2)6.5x-12=4.58\\6.5x=16.58 \\ \\x=16 \frac{58}{100} :6 \frac{5}{10} \\ \\ x=16 \frac{29}{50} :6 \frac{1}{2} \\ \\x= \frac{829*2}{50*13} = \frac{829}{325} =2 \frac{179}{325}$