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5*0.9^x=3.6^x
We move all terms to the left:
5*0.9^x-(3.6^x)=0
Wy multiply elements
0x-(3.6^x)=0
We get rid of parentheses
0x-3.6^x=0
We add all the numbers together, and all the variables
x-3.6^x=0
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