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-5x+21=-3x+27
We move all terms to the left:
-5x+21-(-3x+27)=0
We get rid of parentheses
-5x+3x-27+21=0
We add all the numbers together, and all the variables
-2x-6=0
We move all terms containing x to the left, all other terms to the right
-2x=6
x=6/-2
x=-3
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