Question

(x*3/7)=x-40 Dau multe puncte

Answer 1

$\frac{3*x}{7}= \frac{x-40}{1}=> \frac{3x}{7}= \frac{x-40}{1}=>3x=7x- 280=>7x-3x = 280$
$4x=280 / : 4 => x = 70$
Mai sus la fractie,  inmultim incrucis,

Answer 2

amplificam cu 7

3*x=7x-40
40=4x
x=10