90=7x+21+2x-3

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Solution for 90=7x+21+2x-3 equation: 



90=7x+21+2x-3

We move all terms to the left:

90-(7x+21+2x-3)=0

We add all the numbers together, and all the variables

-(9x+18)+90=0

We get rid of parentheses

-9x-18+90=0

We add all the numbers together, and all the variables

-9x+72=0

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

-9x=-72

x=-72/-9

x=+8

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