3A + 7B - 6A - 4B = - 3A + 3B
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8C + ( 5 - C ) - ( 7 + 11C ) = 8C + 5 - C - 7 - 11C = - 4C - 2
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4 - 5 * ( 3Y + 8 ) = 4 - 15Y - 40 = - 15Y - 36
1)2-(3а-1)(а+5)=2-3а2-14а+5
2)(2х-3)(-2х+2)=4х^2+4х+6х-6=-4х^2+10х-6