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4-x/5=12
We move all terms to the left:
4-x/5-(12)=0
We add all the numbers together, and all the variables
-x/5-8=0
We multiply all the terms by the denominator
-x-8*5=0
We add all the numbers together, and all the variables
-1x-40=0
We move all terms containing x to the left, all other terms to the right
-x=40
x=40/-1
x=-40
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