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10x+9=5x-9
We move all terms to the left:
10x+9-(5x-9)=0
We get rid of parentheses
10x-5x+9+9=0
We add all the numbers together, and all the variables
5x+18=0
We move all terms containing x to the left, all other terms to the right
5x=-18
x=-18/5
x=-3+3/5
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