(30+3x)+21=90

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Solution for (30+3x)+21=90 equation: 



(30+3x)+21=90

We move all terms to the left:

(30+3x)+21-(90)=0

We add all the numbers together, and all the variables

(3x+30)+21-90=0

We add all the numbers together, and all the variables

(3x+30)-69=0

We get rid of parentheses

3x+30-69=0

We add all the numbers together, and all the variables

3x-39=0

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

3x=39

x=39/3

x=13

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