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(x+30)+(2x)=117
We move all terms to the left:
(x+30)+(2x)-(117)=0
We add all the numbers together, and all the variables
2x+(x+30)-117=0
We get rid of parentheses
2x+x+30-117=0
We add all the numbers together, and all the variables
3x-87=0
We move all terms containing x to the left, all other terms to the right
3x=87
x=87/3
x=29
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