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3x-39=5x-45
We move all terms to the left:
3x-39-(5x-45)=0
We get rid of parentheses
3x-5x+45-39=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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