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3x(6-12)=15
We move all terms to the left:
3x(6-12)-(15)=0
We add all the numbers together, and all the variables
3x(-6)-15=0
We multiply parentheses
-18x-15=0
We move all terms containing x to the left, all other terms to the right
-18x=15
x=15/-18
x=-5/6
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