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

1.3x-80=0

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

1.3x=80

x=80/1.3

x=61+0.7/1.3

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