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-12-x/3=-15
We move all terms to the left:
-12-x/3-(-15)=0
We add all the numbers together, and all the variables
-x/3+3=0
We multiply all the terms by the denominator
-x+3*3=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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