0.9x-12=3x+9

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Solution for 0.9x-12=3x+9 equation: 



0.9x-12=3x+9

We move all terms to the left:

0.9x-12-(3x+9)=0

We get rid of parentheses

0.9x-3x-9-12=0

We add all the numbers together, and all the variables

-2.1x-21=0

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

-2.1x=21

x=21/-2.1

x=-10

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