4x+3x+7x=128

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Solution for 4x+3x+7x=128 equation: 



4x+3x+7x=128

We move all terms to the left:

4x+3x+7x-(128)=0

We add all the numbers together, and all the variables

14x-128=0

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

14x=128

x=128/14

x=9+1/7

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