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13(x+x)=63
We move all terms to the left:
13(x+x)-(63)=0
We add all the numbers together, and all the variables
13(+2x)-63=0
We multiply parentheses
26x-63=0
We move all terms containing x to the left, all other terms to the right
26x=63
x=63/26
x=2+11/26
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