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13+7x=8x+5
We move all terms to the left:
13+7x-(8x+5)=0
We get rid of parentheses
7x-8x-5+13=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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