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9x+5=10x+21
We move all terms to the left:
9x+5-(10x+21)=0
We get rid of parentheses
9x-10x-21+5=0
We add all the numbers together, and all the variables
-1x-16=0
We move all terms containing x to the left, all other terms to the right
-x=16
x=16/-1
x=-16
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