1- Resolva

a) +5+3=
b) - 4 - 2=
c) - 3 - 1=
d) +10-7=
e) +75-80=
f) -50+50=
g) +1-7=
h) -7+2=

2- Resolva as questões do 1° grau
a) 5x+8=7
b) 2x+7= -5x+10
c) 8x+12= -4​
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