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3x+128=15x-16
We move all terms to the left:
3x+128-(15x-16)=0
We get rid of parentheses
3x-15x+16+128=0
We add all the numbers together, and all the variables
-12x+144=0
We move all terms containing x to the left, all other terms to the right
-12x=-144
x=-144/-12
x=+12
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