99=3x+90

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Solution for 99=3x+90 equation: 



99=3x+90

We move all terms to the left:

99-(3x+90)=0

We get rid of parentheses

-3x-90+99=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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