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-21=5x+9
We move all terms to the left:
-21-(5x+9)=0
We get rid of parentheses
-5x-9-21=0
We add all the numbers together, and all the variables
-5x-30=0
We move all terms containing x to the left, all other terms to the right
-5x=30
x=30/-5
x=-6
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