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9=8x+5x
We move all terms to the left:
9-(8x+5x)=0
We add all the numbers together, and all the variables
-(+13x)+9=0
We get rid of parentheses
-13x+9=0
We move all terms containing x to the left, all other terms to the right
-13x=-9
x=-9/-13
x=9/13
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