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9x-4x+128=9x+80
We move all terms to the left:
9x-4x+128-(9x+80)=0
We add all the numbers together, and all the variables
5x-(9x+80)+128=0
We get rid of parentheses
5x-9x-80+128=0
We add all the numbers together, and all the variables
-4x+48=0
We move all terms containing x to the left, all other terms to the right
-4x=-48
x=-48/-4
x=+12
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