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(2x-2)+(2x+1)+(3x-1)=2x-2+2x+1+3x-1=7x-2
(3x+1)+(x-1)+(3x-2)=3x+1+x-1+3x-2=7x-2
(2x-1)+(2x-2)+(3x+1)=2x-1+2x-2+3x+1=7x-2
(4x-2)+(2x+1)+(x-1)=4x-2+2x+1+x-1=7x-2
(x+1)+(3x-1)+(3x-2)=x+1+3x-1+3x-2=7x-2
(2x-1)+(2x+1)+(3x-2)=2x-1+2x+1+3x-2=7x-2
(x+1)+(2x+1)+(3x+1)=x+1+2x+1+3x+1=6x+3