99-13x+21=7x

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Solution for 99-13x+21=7x equation: 



99-13x+21=7x

We move all terms to the left:

99-13x+21-(7x)=0

We add all the numbers together, and all the variables

-20x+120=0

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

-20x=-120

x=-120/-20

x=+6

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