Question

решите уравнение
x/3 + x/4 = 7

Answer 1

$frac{x}{3}+frac{x}{4}=7|*12 \ \ 4x+3x=84$
7x=84|:7
x=12
Ответ:12.

Answer 2

x/3+x/4=7
4x/12+3x/12=7
7x/12=7/1
7x/12=84/12
7x=84
x=12