5x-80=21x

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Solution for 5x-80=21x equation: 



5x-80=21x

We move all terms to the left:

5x-80-(21x)=0

We add all the numbers together, and all the variables

-16x-80=0

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

-16x=80

x=80/-16

x=-5

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