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7x-(x-3)=45
We move all terms to the left:
7x-(x-3)-(45)=0
We get rid of parentheses
7x-x+3-45=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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