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3x+4+2x-1+3x+4+2x-1=40
We move all terms to the left:
3x+4+2x-1+3x+4+2x-1-(40)=0
We add all the numbers together, and all the variables
10x-34=0
We move all terms containing x to the left, all other terms to the right
10x=34
x=34/10
x=3+2/5
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