90=20+4x

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Solution for 90=20+4x equation: 



90=20+4x

We move all terms to the left:

90-(20+4x)=0

We add all the numbers together, and all the variables

-(4x+20)+90=0

We get rid of parentheses

-4x-20+90=0

We add all the numbers together, and all the variables

-4x+70=0

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

-4x=-70

x=-70/-4

x=17+1/2

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