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4x+15=12x+65
We move all terms to the left:
4x+15-(12x+65)=0
We get rid of parentheses
4x-12x-65+15=0
We add all the numbers together, and all the variables
-8x-50=0
We move all terms containing x to the left, all other terms to the right
-8x=50
x=50/-8
x=-6+1/4
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