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9x-20=7x+10
We move all terms to the left:
9x-20-(7x+10)=0
We get rid of parentheses
9x-7x-10-20=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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