Question

(x+3)/5=(2x-1)/12 должно получиться 20,5 вроде

Answer 1

$\frac{x + 3}{5} = \frac{2x - 1}{12}$

Умножить уравнение на 60

$\frac{60(x + 3)}{5} = \frac{60(2x - 1)}{12} \\ 12(x + 3) = 5(2x - 1) \\ 12x + 36 = 10x - 5 \\ 12x - 10x = - 5 - 36 \\ 2x = - 41 \\ x = - 41 \div 2 \\ x = - 20.5$

Answer 2

$\frac{x + 3}{5} = \frac{2x - 1}{12} \\ 12(x + 3) = 5(2x - 1) \\ 12x + 36 = 10x - 5 \\ 12x - 10x = - 36 - 5 \\ 2x = - 41 \\ x = \frac{ - 41}{2} \\ x = - 20.5$