0.4^x=-1

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Solution for 0.4^x=-1 equation: 



0.4^x=-1

We move all terms to the left:

0.4^x-(-1)=0

We add all the numbers together, and all the variables

0.4^x+1=0

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

0.4^x=-1

x=-1/1

x=-1

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