X+(3x)=80

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Solution for X+(3x)=80 equation: 



X+(3X)=80

We move all terms to the left:

X+(3X)-(80)=0

We add all the numbers together, and all the variables

4X-80=0

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

4X=80

X=80/4

X=20

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