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13x+9=7x+63
We move all terms to the left:
13x+9-(7x+63)=0
We get rid of parentheses
13x-7x-63+9=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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