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5x-5(x-9)=10x-9
We move all terms to the left:
5x-5(x-9)-(10x-9)=0
We multiply parentheses
5x-5x-(10x-9)+45=0
We get rid of parentheses
5x-5x-10x+9+45=0
We add all the numbers together, and all the variables
-10x+54=0
We move all terms containing x to the left, all other terms to the right
-10x=-54
x=-54/-10
x=5+2/5
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