(X-21)+(2x-15)=90

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Solution for (X-21)+(2x-15)=90 equation: 



(X-21)+(2X-15)=90

We move all terms to the left:

(X-21)+(2X-15)-(90)=0

We get rid of parentheses

X+2X-21-15-90=0

We add all the numbers together, and all the variables

3X-126=0

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

3X=126

X=126/3

X=42

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