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-2x+20=5x-1
We move all terms to the left:
-2x+20-(5x-1)=0
We get rid of parentheses
-2x-5x+1+20=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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