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(12-x)/5=3
We move all terms to the left:
(12-x)/5-(3)=0
We add all the numbers together, and all the variables
(-1x+12)/5-3=0
We multiply all the terms by the denominator
(-1x+12)-3*5=0
We add all the numbers together, and all the variables
(-1x+12)-15=0
We get rid of parentheses
-1x+12-15=0
We add all the numbers together, and all the variables
-1x-3=0
We move all terms containing x to the left, all other terms to the right
-x=3
x=3/-1
x=-3
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