3x-12=4x+128

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Solution for 3x-12=4x+128 equation: 



3x-12=4x+128

We move all terms to the left:

3x-12-(4x+128)=0

We get rid of parentheses

3x-4x-128-12=0

We add all the numbers together, and all the variables

-1x-140=0

We move all terms containing x to the left, all other terms to the right

-x=140

x=140/-1

x=-140

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