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5=100*0.5^x
We move all terms to the left:
5-(100*0.5^x)=0
We get rid of parentheses
-100*0.5^x+5=0
Wy multiply elements
0x+5=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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