(10x+21)+13x=90

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Solution for (10x+21)+13x=90 equation: 



(10x+21)+13x=90

We move all terms to the left:

(10x+21)+13x-(90)=0

We add all the numbers together, and all the variables

13x+(10x+21)-90=0

We get rid of parentheses

13x+10x+21-90=0

We add all the numbers together, and all the variables

23x-69=0

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

23x=69

x=69/23

x=3

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