how do I store a function into a variable and solve it?

I am trying to calculate this function: 𝑓(𝑡) = 4(sin(2𝜋𝑡)) + exp(−𝑡)/𝑡

but it keeps on telling me 'Error using sym/assume Too many output arguments.'

syms t
y =  4*sin(2*pi*t) + exp(-t)./t;
eqn = y == 0

eqn = 

solv= solve(eqn,t)

Warning: Unable to solve symbolically. Returning a numeric solution using vpasolve.

solv = 

98.5

[Star Strider]

There are likely an infinity of solutions —

syms t
y =  4*sin(2*pi*t) + exp(-t)./t;

figure
fplot(y, [0 10])
grid

.

[sumaiya hossain]

The range for the question was -3<t<10

so I did this:

but it still says Unable to solve symbolically, returing to numeric solution using vpasolve

in sym/solve line 304

In (line 7)

syms t
y = 4*sin(2*pi*t) + exp(-t)./t

y = 

eqn = y -- 0

eqn = 

figure 
fplot(y,[-3 10])
grid 

solv =solve(eqn,t)

Warning: Unable to solve symbolically. Returning a numeric solution using vpasolve.

solv = 

98.5

[Star Strider]

There remain an infinity of solutions!

[sumaiya hossain]

Hi thank you for your help, I used pasolve to gives such one value out of an infinite number of possible solutions