12x+21=28x+9

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Solution for 12x+21=28x+9 equation: 



12x+21=28x+9

We move all terms to the left:

12x+21-(28x+9)=0

We get rid of parentheses

12x-28x-9+21=0

We add all the numbers together, and all the variables

-16x+12=0

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

-16x=-12

x=-12/-16

x=3/4

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