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108=6x-21+39
We move all terms to the left:
108-(6x-21+39)=0
We add all the numbers together, and all the variables
-(6x+18)+108=0
We get rid of parentheses
-6x-18+108=0
We add all the numbers together, and all the variables
-6x+90=0
We move all terms containing x to the left, all other terms to the right
-6x=-90
x=-90/-6
x=+15
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