6x+18+3x=90

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



6x+18+3x=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

9x-72=0

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

9x=72

x=72/9

x=8

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