x+3x+4x=80

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Solution for x+3x+4x=80 equation: 



x+3x+4x=80

We move all terms to the left:

x+3x+4x-(80)=0

We add all the numbers together, and all the variables

8x-80=0

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

8x=80

x=80/8

x=10

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