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15x+2(x+1)=23
We move all terms to the left:
15x+2(x+1)-(23)=0
We multiply parentheses
15x+2x+2-23=0
We add all the numbers together, and all the variables
17x-21=0
We move all terms containing x to the left, all other terms to the right
17x=21
x=21/17
x=1+4/17
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