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b) 2a²+a² = 3a²
c) a²-2b+3b = a²+b
d) 2a+3b+4a-2b = 6a+b
e) 120a²/12a² = 10a²
f) 2b . 4b/(-b) = -8b
g) a . (3b+2a) = 3ab+2a²
h) (2a²-6ab)/2a = a-3b