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x+(x+31)=92
We move all terms to the left:
x+(x+31)-(92)=0
We get rid of parentheses
x+x+31-92=0
We add all the numbers together, and all the variables
2x-61=0
We move all terms containing x to the left, all other terms to the right
2x=61
x=61/2
x=30+1/2
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