Question

Resolva as questoes
A)3(x-3)-1=20
B)3(x-2)=2(2x-6

Answer 1

A) 3(x-3)-1=20
3x-9-1=20
3x=20+1+9
3x=30
x=10
B) 3(x-2)=2(2x-6)
3x-6=4x-12
3x-4x=6-12
-x=-6*(-1)
x=6

Answer 2

$a)3x - 9 - 1 = 20 \\ 3x = 20 + 10 \\ 3x = 30 \\ x = \frac{30}{3} \\ x = 10 \\ \\ b)3(x - 2) = 2(2x - 6) \\ 3x - 6 = 4x - 12 \\ 3x - 4x = - 12 + 6 \\ - x = - 6.( - 1) \\ x = 6$