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7x-(5x+3)=3x-39
We move all terms to the left:
7x-(5x+3)-(3x-39)=0
We get rid of parentheses
7x-5x-3x-3+39=0
We add all the numbers together, and all the variables
-1x+36=0
We move all terms containing x to the left, all other terms to the right
-x=-36
x=-36/-1
x=+36
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