0.3x-0.8x-3=7

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Solution for 0.3x-0.8x-3=7 equation: 



0.3x-0.8x-3=7

We move all terms to the left:

0.3x-0.8x-3-(7)=0

We add all the numbers together, and all the variables

-0.5x-10=0

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

-0.5x=10

x=10/-0.5

x=-20

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