Question

Resolva as equações e determine o valor desconhecido:

a)(5+x)-10=4
b)8+2(x-3)=8
c)-2(x-1)=3x+5 d)5x+2(3+x)=5 e)-3x-4-(2x+1)=-2(x-3)
f)-(-x+1)=-2x+2(x-5)
g)-4x-(-x+1)=2+(x-3)
h)-5(x-2)+3(x-7)=0
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Answer 1

a) (5+x)-10=4
5+x-10=4
x=4-5+10
x=9
b) 8+2(x-3)=8 2x=6
8+2x-6=8 x=6/2
2+2x=8 x=3
2x=8-2
c) -2(x-1)=3x+5 5x=-3
-2x+2=3x+5 x=-3/5
-2x-3x=5-2
-5x=3(-1)
d) 5x+2(3+x)=5 x=-1/7
5x+6+2x=5
7x=5-6
7x=-1
e) -3x-4-(2x+1)=-2(x-3) -3x=11(-1)
-3x-4-2x-1=-2x+6 3x=-11
-5x-5=-2x+6 x=-11/3
-5x+2x=6+5
f) -(-x+1)=-2x+2(x-5) x=-9
x-1=-2x+2x-10
x-1=-10
x=-10+1
g) -4x-(-x+1)=2+(x-3) -4x=0(-1)
-4x+x-1=2+x-3 4x=0
-3x-1=-1+x x=0/4
-3x-x=-1+1 x=0
h) -5(x-2)+3(x-7)=0 2x=-11
-5x+10+3x-21=0 x=-11/2
-5x+3x=-10+21
-2x=11(-1)