Помогите пожалуйста!
1)(18-3x)-(4+2x)=-6
2)(z-2)+(z-1)+z=-3
3)21+(20-4x)-(11-2x)=0
4)4(x-7)=3x+5
5)-5x+3(3+2x)=7
6)30-x=3(20-x)
С решением
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