80=3x+2x

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Solution for 80=3x+2x equation: 



80=3x+2x

We move all terms to the left:

80-(3x+2x)=0

We add all the numbers together, and all the variables

-(+5x)+80=0

We get rid of parentheses

-5x+80=0

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

-5x=-80

x=-80/-5

x=+16

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