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2x+1+2x+3+2x+5=57
We move all terms to the left:
2x+1+2x+3+2x+5-(57)=0
We add all the numbers together, and all the variables
6x-48=0
We move all terms containing x to the left, all other terms to the right
6x=48
x=48/6
x=8
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