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9x+10=7x+21
We move all terms to the left:
9x+10-(7x+21)=0
We get rid of parentheses
9x-7x-21+10=0
We add all the numbers together, and all the variables
2x-11=0
We move all terms containing x to the left, all other terms to the right
2x=11
x=11/2
x=5+1/2
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