Solve for a
a=\frac{1}{xe^{x}}
x\neq 0
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xe^{x}a=1
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by a.
\frac{xe^{x}a}{xe^{x}}=\frac{1}{xe^{x}}
Divide both sides by xe^{x}.
a=\frac{1}{xe^{x}}
Dividing by xe^{x} undoes the multiplication by xe^{x}.
a=\frac{1}{xe^{x}}\text{, }a\neq 0
Variable a cannot be equal to 0.
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