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4=13-x/2
We move all terms to the left:
4-(13-x/2)=0
We add all the numbers together, and all the variables
-(-x/2+13)+4=0
We get rid of parentheses
x/2-13+4=0
We multiply all the terms by the denominator
x-13*2+4*2=0
We add all the numbers together, and all the variables
x-18=0
We move all terms containing x to the left, all other terms to the right
x=18
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