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135=6x+9
We move all terms to the left:
135-(6x+9)=0
We get rid of parentheses
-6x-9+135=0
We add all the numbers together, and all the variables
-6x+126=0
We move all terms containing x to the left, all other terms to the right
-6x=-126
x=-126/-6
x=+21
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