(4x+5)+(5x+4)=90

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Solution for (4x+5)+(5x+4)=90 equation: 



(4x+5)+(5x+4)=90

We move all terms to the left:

(4x+5)+(5x+4)-(90)=0

We get rid of parentheses

4x+5x+5+4-90=0

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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