MATLAB: Modular operation in matlab

modulo

I hav an equation 2750 = x mod 7829. How do i calculate x in matlab?

Assuming you mean 2750 = mod(x,7829), there are infinitely many solutions:

x = 2750 + n * 7829, for any integer n

sum(X(:)>100);

var = input('enter 2 by 2 matrix');
f = @(x) input('enter equation like 3*x.^2 + 4*x for example')
f(var)

Like this?