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12-x/4=20
We move all terms to the left:
12-x/4-(20)=0
We add all the numbers together, and all the variables
-x/4-8=0
We multiply all the terms by the denominator
-x-8*4=0
We add all the numbers together, and all the variables
-1x-32=0
We move all terms containing x to the left, all other terms to the right
-x=32
x=32/-1
x=-32
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