9x-18+11x-12=90

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Solution for 9x-18+11x-12=90 equation: 



9x-18+11x-12=90

We move all terms to the left:

9x-18+11x-12-(90)=0

We add all the numbers together, and all the variables

20x-120=0

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

20x=120

x=120/20

x=6

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