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-21=5x-1
We move all terms to the left:
-21-(5x-1)=0
We get rid of parentheses
-5x+1-21=0
We add all the numbers together, and all the variables
-5x-20=0
We move all terms containing x to the left, all other terms to the right
-5x=20
x=20/-5
x=-4
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