0.4x+12.8=40

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Solution for 0.4x+12.8=40 equation: 



0.4x+12.8=40

We move all terms to the left:

0.4x+12.8-(40)=0

We add all the numbers together, and all the variables

0.4x-27.2=0

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

0.4x=27.2

x=27.2/0.4

x=68+-3.5527136788E-15/0.4

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