[7e^(3x)]/e is just 7*[e^(3x)/e^1] by the associative property of multiplication and divisionWhen dividing quantities with exponents, you can subtract the exponent of the denominator from the exponent of the numerator IF THE BASES ARE THE SAME.In our case, both bases are e.The expression 7*[e^(3x)/e^1] simplifies to7*e^(3x - 1)I hope this helps.