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13x=45+6x-3
We move all terms to the left:
13x-(45+6x-3)=0
We add all the numbers together, and all the variables
13x-(6x+42)=0
We get rid of parentheses
13x-6x-42=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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