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100+x/5=99
We move all terms to the left:
100+x/5-(99)=0
We add all the numbers together, and all the variables
x/5+1=0
We multiply all the terms by the denominator
x+1*5=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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