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x+x+(x+12)+x+x+(3x+9)=117
We move all terms to the left:
x+x+(x+12)+x+x+(3x+9)-(117)=0
We add all the numbers together, and all the variables
4x+(x+12)+(3x+9)-117=0
We get rid of parentheses
4x+x+3x+12+9-117=0
We add all the numbers together, and all the variables
8x-96=0
We move all terms containing x to the left, all other terms to the right
8x=96
x=96/8
x=12
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