Question

Resolva as equações.

a) 2(x + 1) + 7 = 11

b) 3(x - 1) + x = 5

c) 7 + x = 2(x + 1) + 5

Answer 1

a)2x+2+7=11
2x=11-2-7
2x=2
x=2/2
x=1
b)3x-3+x=5
4x=5+3
4x=8
x=8/4
x=2
c)7+x=2x+2+5
7+x=2x+7
-2x+x=7-7
x=0