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10(X-9)=-10X
We move all terms to the left:
10(X-9)-(-10X)=0
We multiply parentheses
10X-(-10X)-90=0
We get rid of parentheses
10X+10X-90=0
We add all the numbers together, and all the variables
20X-90=0
We move all terms containing X to the left, all other terms to the right
20X=90
X=90/20
X=4+1/2
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