помогите решить уравнения:
3х+7=0;
13-100х=0;
7х-4=х=16;
13-5х=8-2х;
4у+15=6у+17;
5х+(3х-7)=9;
3у-(5-у)=11;
(7х+1)-(6х+3)=5;
(8х+11)-13=9х-5.
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