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5x=9x+21
We move all terms to the left:
5x-(9x+21)=0
We get rid of parentheses
5x-9x-21=0
We add all the numbers together, and all the variables
-4x-21=0
We move all terms containing x to the left, all other terms to the right
-4x=21
x=21/-4
x=-5+1/4
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