3x-9+8x=90

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Solution for 3x-9+8x=90 equation: 



3x-9+8x=90

We move all terms to the left:

3x-9+8x-(90)=0

We add all the numbers together, and all the variables

11x-99=0

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

11x=99

x=99/11

x=9

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