(13x+3)+(x+3)=90

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Solution for (13x+3)+(x+3)=90 equation: 



(13x+3)+(x+3)=90

We move all terms to the left:

(13x+3)+(x+3)-(90)=0

We get rid of parentheses

13x+x+3+3-90=0

We add all the numbers together, and all the variables

14x-84=0

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

14x=84

x=84/14

x=6

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