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7x-15=12x+16
We move all terms to the left:
7x-15-(12x+16)=0
We get rid of parentheses
7x-12x-16-15=0
We add all the numbers together, and all the variables
-5x-31=0
We move all terms containing x to the left, all other terms to the right
-5x=31
x=31/-5
x=-6+1/5
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