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13+x/2=8
We move all terms to the left:
13+x/2-(8)=0
We add all the numbers together, and all the variables
x/2+5=0
We multiply all the terms by the denominator
x+5*2=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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