0.8x-3-0.5x=9

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Solution for 0.8x-3-0.5x=9 equation: 



0.8x-3-0.5x=9

We move all terms to the left:

0.8x-3-0.5x-(9)=0

We add all the numbers together, and all the variables

0.3x-12=0

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

0.3x=12

x=12/0.3

x=40

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