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(2x)+(x+31.5)=122
We move all terms to the left:
(2x)+(x+31.5)-(122)=0
We get rid of parentheses
2x+x+31.5-122=0
We add all the numbers together, and all the variables
3x-90.5=0
We move all terms containing x to the left, all other terms to the right
3x=90.5
x=90.5/3
x=30+0.5/3
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