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Solve for x
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Solve for x (complex solution)
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18+6e^{3-x}+24=84
Multiply both sides of the equation by 6.
42+6e^{3-x}=84
Add 18 and 24 to get 42.
6e^{-x+3}+42=84
Use the rules of exponents and logarithms to solve the equation.
6e^{-x+3}=42
Subtract 42 from both sides of the equation.
e^{-x+3}=7
Divide both sides by 6.
\log(e^{-x+3})=\log(7)
Take the logarithm of both sides of the equation.
\left(-x+3\right)\log(e)=\log(7)
The logarithm of a number raised to a power is the power times the logarithm of the number.
-x+3=\frac{\log(7)}{\log(e)}
Divide both sides by \log(e).
-x+3=\log_{e}\left(7\right)
By the change-of-base formula \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
-x=\ln(7)-3
Subtract 3 from both sides of the equation.
x=\frac{\ln(7)-3}{-1}
Divide both sides by -1.