90+27=21x-9

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Solution for 90+27=21x-9 equation: 



90+27=21x-9

We move all terms to the left:

90+27-(21x-9)=0

We add all the numbers together, and all the variables

-(21x-9)+117=0

We get rid of parentheses

-21x+9+117=0

We add all the numbers together, and all the variables

-21x+126=0

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

-21x=-126

x=-126/-21

x=+6

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