3x+4x=280

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Solution for 3x+4x=280 equation: 



3x+4x=280

We move all terms to the left:

3x+4x-(280)=0

We add all the numbers together, and all the variables

7x-280=0

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

7x=280

x=280/7

x=40

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