MATLAB: Is it wrong to use eval() to read input function

Question

I want to have a program that prompts the users for an equation and solves it with solve().

syms vrb
vname = input('Input variable name: ','s');
str = input('Equation: ','s');
eqn = eval(str);
solu = solve(eqn,vrb);
fprintf('%s is equal to %d.\n',vname,solu)

I also want to expand the program to solving multivariate equations but I feel that the use of eval() might complicate its efficiency to begin with.

Answer 1

 eqn = str2sym(str)