80=3x+2.4x

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Solution for 80=3x+2.4x equation: 



80=3x+2.4x

We move all terms to the left:

80-(3x+2.4x)=0

We add all the numbers together, and all the variables

-(+5.4x)+80=0

We get rid of parentheses

-5.4x+80=0

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

-5.4x=-80

x=-80/-5.4

x=14+3.14285714286/3.85714285714

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