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2x-1+2x+2x-1=7
We move all terms to the left:
2x-1+2x+2x-1-(7)=0
We add all the numbers together, and all the variables
6x-9=0
We move all terms containing x to the left, all other terms to the right
6x=9
x=9/6
x=1+1/2
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