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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(+10x)+90=0

We get rid of parentheses

-10x+90=0

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

-10x=-90

x=-90/-10

x=+9

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