I need to solve an equation that involves the
HeavisideTheta function, but regardless of the method I use Mathematica returns an error message. For example,
NSolve[x*HeavisideTheta[x] == 5, x]
returns the message "This system cannot be solved with methods available to NSolve". A similar message occurs with
Reduce. Clearly the solution to the equation above is x=5. The full equation I need to solve can only be solved numerically. Are there any alternative functions to solve this equation?