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10x-9=7x-27
We move all terms to the left:
10x-9-(7x-27)=0
We get rid of parentheses
10x-7x+27-9=0
We add all the numbers together, and all the variables
3x+18=0
We move all terms containing x to the left, all other terms to the right
3x=-18
x=-18/3
x=-6
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