0.30x-0.20x=3

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Solution for 0.30x-0.20x=3 equation: 



0.30x-0.20x=3

We move all terms to the left:

0.30x-0.20x-(3)=0

We add all the numbers together, and all the variables

0.1x-3=0

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

0.1x=3

x=3/0.1

x=30

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