Выполните действия,результат запишите в стандартном виде:
a)(1+4a)+(a²-3a)
b)(7x²+2x)+(-x²+5)
c)(y²-6y)+(4y-y²)
d)(c²-c+7)-(c²+c+3)
e)(8n³-6n²)-(1+8n³-5n²)
f)(m²+9m+2)-(m²+9m-2)
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