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X-80=65+6X
We move all terms to the left:
X-80-(65+6X)=0
We add all the numbers together, and all the variables
X-(6X+65)-80=0
We get rid of parentheses
X-6X-65-80=0
We add all the numbers together, and all the variables
-5X-145=0
We move all terms containing X to the left, all other terms to the right
-5X=145
X=145/-5
X=-29
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