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-x+3=6x-81
We move all terms to the left:
-x+3-(6x-81)=0
We add all the numbers together, and all the variables
-1x-(6x-81)+3=0
We get rid of parentheses
-1x-6x+81+3=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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