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-x/4-12=20
We move all terms to the left:
-x/4-12-(20)=0
We add all the numbers together, and all the variables
-x/4-32=0
We multiply all the terms by the denominator
-x-32*4=0
We add all the numbers together, and all the variables
-1x-128=0
We move all terms containing x to the left, all other terms to the right
-x=128
x=128/-1
x=-128
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