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15989=645*1.01^x
We move all terms to the left:
15989-(645*1.01^x)=0
We get rid of parentheses
-645*1.01^x+15989=0
Wy multiply elements
-645x+15989=0
We move all terms containing x to the left, all other terms to the right
-645x=-15989
x=-15989/-645
x=24+509/645
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