13x+(10x+21)=90

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



13x+(10x+21)=90

We move all terms to the left:

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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