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8x+39=6x+45
We move all terms to the left:
8x+39-(6x+45)=0
We get rid of parentheses
8x-6x-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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