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9x-10=7x-28
We move all terms to the left:
9x-10-(7x-28)=0
We get rid of parentheses
9x-7x+28-10=0
We add all the numbers together, and all the variables
2x+18=0
We move all terms containing x to the left, all other terms to the right
2x=-18
x=-18/2
x=-9
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