(X,y)=90

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Solution for (X,y)=90 equation: 



(X.X)=90

We move all terms to the left:

(X.X)-(90)=0

We add all the numbers together, and all the variables

(+X.X)-90=0

We get rid of parentheses

X.X-90=0

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

X.X=90

X=90/1

X=90

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