8x-9+10x+9=90

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Solution for 8x-9+10x+9=90 equation: 



8x-9+10x+9=90

We move all terms to the left:

8x-9+10x+9-(90)=0

We add all the numbers together, and all the variables

18x-90=0

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

18x=90

x=90/18

x=5

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