Question

Resolva as equações.
A)4(x+1)=12
B)5(3-x)-4x=18
C)9x-3(2x+2)=15
D)2,5(x-2)-1,5x=1
E)3,5x+8=2(x+7)
F)6(3x+2)-8=-2
G)-3(x-5)-2(2x+1)=-8

Answer 1

a) 4(x+1)=12
4x+4=12
4x=12-4
4x=8
x=8/4
x=2
b) 5(3-x)-4x=18
15-5x-4x=18
-5x-4x=18-15
-9x=3.(-1)
9x=-3
x=-3/9 (:3)
x=-1/3
c) 9x-3(2x+2)=15
9x-6x-6=15
9x-6x=15+6
3x=21
x=21/3
x=7
d) 2,5(x-2)-1,5x=1
2,5x-5-1,5x=1
2,5x-1,5x=1+5
x=6
e) 3,5x+8=2(x+7)
3,5x+8=2x+14
3,5x-2x=14-8
1,5x=6
x=6/1,5
x=4
f) 6(3x+2)-8=-2
18x+12-8=-2
18x=-2+8-12
18x=6-12
18x=-6
x=-6/18 (:6)
x=-1/3
g) -3(x-5)-2(2x+1)=-8
-3x+15-4x-2=-8
-3x-4x=-8+2-15
-7x=-6-15
-7x=-21.(-1)
7x=21
x=21/7
x=3