5у+8у+9=100; х-(50-Х)=12; (18-3х)-(4+2х)=-6; х+(х+1)+(х+2)=9; (z-2)+(z-1)+z=-3; 21+(20-4х)-(11-2х)=0 ребята срочно,отмечу как лучшее  
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