0.9x+12=0.8x-9

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Solution for 0.9x+12=0.8x-9 equation: 



0.9x+12=0.8x-9

We move all terms to the left:

0.9x+12-(0.8x-9)=0

We get rid of parentheses

0.9x-0.8x+9+12=0

We add all the numbers together, and all the variables

0.1x+21=0

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

0.1x=-21

x=-21/0.1

x=-210

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