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8/9=x+13(7)x
We move all terms to the left:
8/9-(x+13(7)x)=0
We add all the numbers together, and all the variables
-(+138x)+8/9=0
We get rid of parentheses
-138x+8/9=0
We multiply all the terms by the denominator
-138x*9+8=0
Wy multiply elements
-1242x+8=0
We move all terms containing x to the left, all other terms to the right
-1242x=-8
x=-8/-1242
x=4/621
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