Помогите пожалуйста! 1) -(х+2у)-(2у+х+1)=
2) -7х+2у-(4х+5)=
3) -(2х+2у-5)-(4+2у-7у)=
4) -2(2х+2у-1)+3(3х-4у-1)=
5) -3(7-2х-у)-5(5-4х+2у)=
Надо на завтра срочно помогите!
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