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-15=6x+3(4+12)
We move all terms to the left:
-15-(6x+3(4+12))=0
We add all the numbers together, and all the variables
-(6x+316)-15=0
We get rid of parentheses
-6x-316-15=0
We add all the numbers together, and all the variables
-6x-331=0
We move all terms containing x to the left, all other terms to the right
-6x=331
x=331/-6
x=-55+1/6
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