Помогите пожалуйста срочно. упростить выражение : 1)6х-(2х-1)-7х=. 2) 2(5х- 4у +1) -3(3х-3у+1)= . 3) а+b+c- (a-b-с)= . 4) 7(2а+5b) - 5(3b -4a)=
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