(X+21)+2x+9=90

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Solution for (X+21)+2x+9=90 equation: 



(X+21)+2X+9=90

We move all terms to the left:

(X+21)+2X+9-(90)=0

We add all the numbers together, and all the variables

2X+(X+21)-81=0

We get rid of parentheses

2X+X+21-81=0

We add all the numbers together, and all the variables

3X-60=0

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

3X=60

X=60/3

X=20

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