9-3+12-21=4x

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Solution for 9-3+12-21=4x equation: 



9-3+12-21=4x

We move all terms to the left:

9-3+12-21-(4x)=0

We add all the numbers together, and all the variables

-4x-3=0

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

-4x=3

x=3/-4

x=-3/4

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