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4x+128=9x+126
We move all terms to the left:
4x+128-(9x+126)=0
We get rid of parentheses
4x-9x-126+128=0
We add all the numbers together, and all the variables
-5x+2=0
We move all terms containing x to the left, all other terms to the right
-5x=-2
x=-2/-5
x=2/5
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