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x/5-7.8=12
We move all terms to the left:
x/5-7.8-(12)=0
We add all the numbers together, and all the variables
x/5-19.8=0
We multiply all the terms by the denominator
x-(19.8)*5=0
We add all the numbers together, and all the variables
x-99=0
We move all terms containing x to the left, all other terms to the right
x=99
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