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21y - 2y = 11 + 27
19 y = 38
y = 38 / 19
y = 2
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b) 9 y - 5 - 2 y - 2 y = 2 y + 40
9 y - 2 y - 2 y = 40 + 5
5 y = 45
y = 45 / 5
y = 9
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c) 3 m + 10 = - m + 15
3 m + m = 15 - 10
4 m = 5
m = 5 / 4 ou 1.25
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