5x+4x+7x=720

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Solution for 5x+4x+7x=720 equation: 



5x+4x+7x=720

We move all terms to the left:

5x+4x+7x-(720)=0

We add all the numbers together, and all the variables

16x-720=0

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

16x=720

x=720/16

x=45

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