efetue as divisões

b) (18y- 12y) + (6y) =
c) (8a-4a2) + (4a2) =
d) (6m3+ 9m2) = (-3m) =
e) (-14x3+ 10x28x) = (2x) =
f) (30x²y + 20xy) = (5xy) =
g) (12a+ 16a²b) = (4a) =
h) (9mºn2-15m) = (-3m2) =​