21x-3x=30

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Solution for 21x-3x=30 equation: 



21x-3x=30

We move all terms to the left:

21x-3x-(30)=0

We add all the numbers together, and all the variables

18x-30=0

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

18x=30

x=30/18

x=1+2/3

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