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50+12.5x=99
We move all terms to the left:
50+12.5x-(99)=0
We add all the numbers together, and all the variables
12.5x-49=0
We move all terms containing x to the left, all other terms to the right
12.5x=49
x=49/12.5
x=3+7.6666666666667/8.3333333333333
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