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10x+9=4x+21
We move all terms to the left:
10x+9-(4x+21)=0
We get rid of parentheses
10x-4x-21+9=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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