n = 7;
R = sym('R', [1 n]);
C = sym('C', [1 n]);
t = 10;
Ztval = 0.004;
Zt = sum( R .* (1 - exp(-t ./( R .* C ) ) ) );
solC1 = solve(Zt == Ztval, C(1), 'ReturnConditions', true);
This will give you solC1.C1 as a solution for C1, subject to a condition listed in solC1.conditions
You cannot solve for all 14 variables when you only have one equation.
