Resolva as equações: a) 4 + x = 12 - 6
b) -5 + y = 6
c) 15 + (-8) + 7 = -16 - 7 + a
d) 18 + 8 + (-5) = -3 + b + 9
b) -5 + y = 6
c) 15 + (-8) + 7 = -16 - 7 + a
d) 18 + 8 + (-5) = -3 + b + 9
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