Question

Qual a proporção de 2-x/x+5=3/4?

Answer 1

$\frac{2-x}{x+5} = \frac{3}{4}$
4(2-x) = 3(x+5)
8-4x = 3x+15
-4x-3x=15-8
-7x=7
x=-1

Questão 2 )

$\frac{x-1}{x-2} = \frac{3}{2}$
2(x-1) = 3(x-2)
2x-2 = 3x-6
2x-3x = -6+2
-x = -4
x=4