80=17+21x

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Solution for 80=17+21x equation: 



80=17+21x

We move all terms to the left:

80-(17+21x)=0

We add all the numbers together, and all the variables

-(21x+17)+80=0

We get rid of parentheses

-21x-17+80=0

We add all the numbers together, and all the variables

-21x+63=0

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

-21x=-63

x=-63/-21

x=+3

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