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