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6x+(-9)=-8x+9
We move all terms to the left:
6x+(-9)-(-8x+9)=0
We add all the numbers together, and all the variables
6x-(-8x+9)-9=0
We get rid of parentheses
6x+8x-9-9=0
We add all the numbers together, and all the variables
14x-18=0
We move all terms containing x to the left, all other terms to the right
14x=18
x=18/14
x=1+2/7
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