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-x=+20=x-4
We move all terms to the left:
-x-(+20)=0
We add all the numbers together, and all the variables
-x-20=0
We add all the numbers together, and all the variables
-1x-20=0
We move all terms containing x to the left, all other terms to the right
-x=20
x=20/-1
x=-20
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