18x+3x=9

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Solution for 18x+3x=9 equation: 



18x+3x=9

We move all terms to the left:

18x+3x-(9)=0

We add all the numbers together, and all the variables

21x-9=0

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

21x=9

x=9/21

x=3/7

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