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15x-5x+9=10x-9
We move all terms to the left:
15x-5x+9-(10x-9)=0
We add all the numbers together, and all the variables
10x-(10x-9)+9=0
We get rid of parentheses
10x-10x+9+9=0
We add all the numbers together, and all the variables
18!=0
There is no solution for this equation
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