Question

Resolva as equações.

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

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

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

d) 8 - 2(x - 5) = 6

e) 12- (x + 3) = 6

f) 3(x - 1) - (2 - x) = 10

Answer 1

a)2x+2+7=11
2x+9=11
2x=11-9
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
d)8-2x-10=6
-2x=6+10-8. ×(-1)
2x=-6-10+8
2x=-8
x=-8/2
x=-4
e)12x-36=6
12x=36+6
x=42/12
x=3,5
f)3x-3-2+x=10
4x=10+3+2
4x=15
x=15/4
x=3,75