-2x=6.4

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Solution for -2x=6.4 equation: 



-2x=6.4

We move all terms to the left:

-2x-(6.4)=0

We add all the numbers together, and all the variables

-2x-6.4=0

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

-2x=6.4

x=6.4/-2

x=-3+0.4/2

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