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8=x/9+4
We move all terms to the left:
8-(x/9+4)=0
We get rid of parentheses
-x/9-4+8=0
We multiply all the terms by the denominator
-x-4*9+8*9=0
We add all the numbers together, and all the variables
-1x+36=0
We move all terms containing x to the left, all other terms to the right
-x=-36
x=-36/-1
x=+36
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