21=7x+98

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Solution for 21=7x+98 equation: 



21=7x+98

We move all terms to the left:

21-(7x+98)=0

We get rid of parentheses

-7x-98+21=0

We add all the numbers together, and all the variables

-7x-77=0

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

-7x=77

x=77/-7

x=-11

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