21+3x-15x=9

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Solution for 21+3x-15x=9 equation: 



21+3x-15x=9

We move all terms to the left:

21+3x-15x-(9)=0

We add all the numbers together, and all the variables

-12x+12=0

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

-12x=-12

x=-12/-12

x=1

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