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-x/12-21=-10
We move all terms to the left:
-x/12-21-(-10)=0
We add all the numbers together, and all the variables
-x/12-11=0
We multiply all the terms by the denominator
-x-11*12=0
We add all the numbers together, and all the variables
-1x-132=0
We move all terms containing x to the left, all other terms to the right
-x=132
x=132/-1
x=-132
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