Apply the property of the product of two powers of the same base in reverse: $a^{m+n}=a^m\cdot a^n$
Group the terms of the differential equation. Move the terms of the $z$ variable to the left side, and the terms of the $x$ variable to the right side of the equality
Integrate both sides of the differential equation, the left side with respect to $z$, and the right side with respect to $x$
Solve the integral $\int\frac{1}{e^{3z}}dz$ and replace the result in the differential equation
Solve the integral $\int4xe^{-3x}dx$ and replace the result in the differential equation
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