O.9y-0,7y=4.2

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Solution for O.9y-0,7y=4.2 equation: 



.9O-0.7O=4.2

We move all terms to the left:

.9O-0.7O-(4.2)=0

We add all the numbers together, and all the variables

0.2O-4.2=0

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

0.2O=4.2

O=4.2/0.2

O=21

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