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2x+18=12-102
We move all terms to the left:
2x+18-(12-102)=0
We add all the numbers together, and all the variables
2x+18-(-90)=0
We add all the numbers together, and all the variables
2x+108=0
We move all terms containing x to the left, all other terms to the right
2x=-108
x=-108/2
x=-54
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