(40-28)(o+13)=90

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Solution for (40-28)(o+13)=90 equation: 



(40-28)(o+13)=90

We move all terms to the left:

(40-28)(o+13)-(90)=0

We add all the numbers together, and all the variables

12(o+13)-90=0

We multiply parentheses

12o+156-90=0

We add all the numbers together, and all the variables

12o+66=0

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

12o=-66

o=-66/12

o=-5+1/2

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