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-21+2x=-5x
We move all terms to the left:
-21+2x-(-5x)=0
We get rid of parentheses
2x+5x-21=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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