a*0.5+6*0.4=3.9

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Solution for a*0.5+6*0.4=3.9 equation: 



a*0.5+6*0.4=3.9

We move all terms to the left:

a*0.5+6*0.4-(3.9)=0

We add all the numbers together, and all the variables

a*0.5-1.5=0

Wy multiply elements

0.5a-1.5=0

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

0.5a=1.5

a=1.5/0.5

a=3

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