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13-(x+8)=7x+3
We move all terms to the left:
13-(x+8)-(7x+3)=0
We get rid of parentheses
-x-7x-8-3+13=0
We add all the numbers together, and all the variables
-8x+2=0
We move all terms containing x to the left, all other terms to the right
-8x=-2
x=-2/-8
x=1/4
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