2x-1+4x-2+x+1= 7x-2
2x-1+4x-2+x+1=7x-2 bo
2x+4x+x-1-2+1=7x-2
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2x-1+4x-2+x+1= 7x-2
2x-1+4x-2+x+1=7x-2 bo
2x+4x+x-1-2+1=7x-2