Помогите решить пожалуйста!) система: 5(х+3)-7(у-8)=68
5х-7у=-3
1. х^2-4х=3х
2. 4(2х+10)-3(х-2)-43
3. 3х-7>4(х+2)
4. 2(3х-1)-3(2х+1)< или = 3
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