21+4x+9=9x

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Solution for 21+4x+9=9x equation: 



21+4x+9=9x

We move all terms to the left:

21+4x+9-(9x)=0

We add all the numbers together, and all the variables

-5x+30=0

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

-5x=-30

x=-30/-5

x=+6

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