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-3x+20=4x-8
We move all terms to the left:
-3x+20-(4x-8)=0
We get rid of parentheses
-3x-4x+8+20=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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