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-4=5x+21
We move all terms to the left:
-4-(5x+21)=0
We get rid of parentheses
-5x-21-4=0
We add all the numbers together, and all the variables
-5x-25=0
We move all terms containing x to the left, all other terms to the right
-5x=25
x=25/-5
x=-5
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