METHOD OF LINES AN ODE15S

Hello everyone,i am new in matlab and i have a pde's system of equations which a want to solve with method of lines and ode15s.The problem is that, i have 7 equations which the 1 after replacement on the left side is equal to zero.It is possible to solve my system with ode15s?Because in my function of ode15s i cant set zero to the left side.How can overcome this? I attach a pdf file with my equations.