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-51=-3x-6
We move all terms to the left:
-51-(-3x-6)=0
We get rid of parentheses
3x+6-51=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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