90=9x+4x-1

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Solution for 90=9x+4x-1 equation: 



90=9x+4x-1

We move all terms to the left:

90-(9x+4x-1)=0

We add all the numbers together, and all the variables

-(13x-1)+90=0

We get rid of parentheses

-13x+1+90=0

We add all the numbers together, and all the variables

-13x+91=0

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

-13x=-91

x=-91/-13

x=+7

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