80=5x-9x

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Solution for 80=5x-9x equation: 



80=5x-9x

We move all terms to the left:

80-(5x-9x)=0

We add all the numbers together, and all the variables

-(-4x)+80=0

We get rid of parentheses

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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