6x-18+3x+9=90

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Solution for 6x-18+3x+9=90 equation: 



6x-18+3x+9=90

We move all terms to the left:

6x-18+3x+9-(90)=0

We add all the numbers together, and all the variables

9x-99=0

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

9x=99

x=99/9

x=11

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