20=100*0.8^x

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Solution for 20=100*0.8^x equation: 



20=100*0.8^x

We move all terms to the left:

20-(100*0.8^x)=0

We get rid of parentheses

-100*0.8^x+20=0

Wy multiply elements

0x+20=0

We add all the numbers together, and all the variables

x+20=0

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

x=-20

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