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5x+2(x+1)=51
We move all terms to the left:
5x+2(x+1)-(51)=0
We multiply parentheses
5x+2x+2-51=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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