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x/2-13=7
We move all terms to the left:
x/2-13-(7)=0
We add all the numbers together, and all the variables
x/2-20=0
We multiply all the terms by the denominator
x-20*2=0
We add all the numbers together, and all the variables
x-40=0
We move all terms containing x to the left, all other terms to the right
x=40
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