- Efetue :

a) (+8x) - (-3x)
b) (-5x) - (11x)
c) (-6y) - (-4y)
d) (+7y) - (+7y)
e) (-3x) - (+4x) + (-3x)
f) (-9x) - (-x)
g) (+2y) -(+5y)
h) (-3m) - (-m)
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