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10=150*0.85^x
We move all terms to the left:
10-(150*0.85^x)=0
We get rid of parentheses
-150*0.85^x+10=0
Wy multiply elements
0x+10=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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