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27=2x+7x
We move all terms to the left:
27-(2x+7x)=0
We add all the numbers together, and all the variables
-(+9x)+27=0
We get rid of parentheses
-9x+27=0
We move all terms containing x to the left, all other terms to the right
-9x=-27
x=-27/-9
x=+3
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