140+150+130+x=720

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Solution for 140+150+130+x=720 equation: 



140+150+130+x=720

We move all terms to the left:

140+150+130+x-(720)=0

We add all the numbers together, and all the variables

x-300=0

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

x=300

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