Question

gente pelo amor de deus me ajudem.

Answer 1

a) 4(x+3)=20 ∴ 4x +12 = 20 ∴ 4x = 20-12 ∴ 4x = 8 ∴ x = 8/4 ∴ x = 2
b) 5(2x-1) = 2(x+4) ∴ 10x - 5=2x + 8 ∴ 10x-2x=8+5 ∴ 8x = 13 ∴ x = 13/8
c) 10 -2(x+3)=8+3(2x+5) 
10-2x-6=8+6x+15 ∴ 6x+2x = 23-4 ∴ 8x=19 ∴ x=19/8

d) 3x/5 -1/2 = x -2/5
$\frac{3x}{5}-x=\frac{1}{2}-\frac{2}{5} \\ \\ \frac{3x}{5}-\frac{5x}{5}=\frac{5-4}{10}\\ \\ \frac{-2x}{5}=\frac{1}{10}\\ \\ -20x=5\\ \\ x=\frac{-5}{20}=\frac{-1}{4}$