Efetue as adiçoes e subtraçoes de polinomios
a) (4a+3b)+2(2a-7b)
b) (7x²+3x+7)+3(x²-8x+1)
c)(y³+3y²+2y)+2(y³-3y²+6y+5)
d)(x²-6x+5)-4(x²+8x-9)
e)(4a²-2a+6)-2(3a²-3a+7)
f)(-3ab+2a²+b²)-3(2a²+7b²+4ab)
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