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(6x-4)+(8x-4)+(9x-4)=80
We move all terms to the left:
(6x-4)+(8x-4)+(9x-4)-(80)=0
We get rid of parentheses
6x+8x+9x-4-4-4-80=0
We add all the numbers together, and all the variables
23x-92=0
We move all terms containing x to the left, all other terms to the right
23x=92
x=92/23
x=4
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