15x-3=21x

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Solution for 15x-3=21x equation: 



15x-3=21x

We move all terms to the left:

15x-3-(21x)=0

We add all the numbers together, and all the variables

-6x-3=0

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

-6x=3

x=3/-6

x=-1/2

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