0.8x-7.9=-3.9

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Solution for 0.8x-7.9=-3.9 equation: 



0.8x-7.9=-3.9

We move all terms to the left:

0.8x-7.9-(-3.9)=0

We add all the numbers together, and all the variables

0.8x-4=0

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

0.8x=4

x=4/0.8

x=5

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