(13x-8x)*9=90

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Solution for (13x-8x)*9=90 equation: 



(13x-8x)*9=90

We move all terms to the left:

(13x-8x)*9-(90)=0

We add all the numbers together, and all the variables

(+5x)*9-90=0

We multiply parentheses

45x-90=0

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

45x=90

x=90/45

x=2

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