using dsolve to equation

equation is : d(x1)/dt (t) = -x1(t)*alpha+p

syms x1 t

tank1 = 'diff (x1,t)= - x1* alpha + p'

soln1 = dsolve(tank1,'x1(0) = 0')

it worked at somepoint then i cleared my workspace and then poof stopped. im guessing i had declared something in syms but dont remember ma

error getting

Error using mupadengine/feval (line 163)

Cannot identify differential equations. To solve

algebraic equations, use 'solve' or 'vpasolve'.

Error in dsolve>mupadDsolve (line 336)

T = feval(symengine,'symobj::dsolve',sys,x,options);

Error in dsolve (line 193)

sol = mupadDsolve(args, options);

Answer 1

[madhan ravi]

Define alpha as symbolic variable , remove strings and before -x1 it should be == and intial condition x(0)==0 without strings around it

Answer 2

[Torsten]

syms x1(t) alpha p
eqn = diff(x1,t) == -x1*alpha+p;
cond = x1(0) == 0;
x1Sol(t) = dsolve(eqn,cond)

[Brenda Galabe]

awesome thanks