90=21+2x

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Solution for 90=21+2x equation: 



90=21+2x

We move all terms to the left:

90-(21+2x)=0

We add all the numbers together, and all the variables

-(2x+21)+90=0

We get rid of parentheses

-2x-21+90=0

We add all the numbers together, and all the variables

-2x+69=0

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

-2x=-69

x=-69/-2

x=34+1/2

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