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4=x/9+1
We move all terms to the left:
4-(x/9+1)=0
We get rid of parentheses
-x/9-1+4=0
We multiply all the terms by the denominator
-x-1*9+4*9=0
We add all the numbers together, and all the variables
-1x+27=0
We move all terms containing x to the left, all other terms to the right
-x=-27
x=-27/-1
x=+27
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