12x+21-15x+3=30

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Solution for 12x+21-15x+3=30 equation: 



12x+21-15x+3=30

We move all terms to the left:

12x+21-15x+3-(30)=0

We add all the numbers together, and all the variables

-3x-6=0

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

-3x=6

x=6/-3

x=-2

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