90=5x-1+4x+1+5x-1+4x+1

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Solution for 90=5x-1+4x+1+5x-1+4x+1 equation: 



90=5x-1+4x+1+5x-1+4x+1

We move all terms to the left:

90-(5x-1+4x+1+5x-1+4x+1)=0

We add all the numbers together, and all the variables

-(+18x)+90=0

We get rid of parentheses

-18x+90=0

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

-18x=-90

x=-90/-18

x=+5

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