90=20+7x

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Solution for 90=20+7x equation: 



90=20+7x

We move all terms to the left:

90-(20+7x)=0

We add all the numbers together, and all the variables

-(7x+20)+90=0

We get rid of parentheses

-7x-20+90=0

We add all the numbers together, and all the variables

-7x+70=0

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

-7x=-70

x=-70/-7

x=+10

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