a) 2x +3=7
b) 5(b+3)-2=-b+23
c) -x-12=-1
d) 7-9y=4(8-y)
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Resposta:
a)2x+3=7
2×=7-3
2×=4
×=4/2
×=2
b)5(b+3)-2=-b+23
5b+15-2=-b+23
5b+b=23-15+2
6b=10
b=10/6÷2
b=5/3
c)-×-12=-1
-×=+12-1
-×=+11 .(-1)
×=-11
d)7-9y=4(8-y)
7-9y=32-y
-9y+y=32-7
-8y=25.(-1)
8y=-25
y=-25/8
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