(x+21)+(7x-3)=90

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Solution for (x+21)+(7x-3)=90 equation: 



(x+21)+(7x-3)=90

We move all terms to the left:

(x+21)+(7x-3)-(90)=0

We get rid of parentheses

x+7x+21-3-90=0

We add all the numbers together, and all the variables

8x-72=0

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

8x=72

x=72/8

x=9

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