values={T: 300, a: 3, f: 6, W: 200}

print sy.solve([
    sy.Eq(f, m*a).subs(values),
    sy.Eq(T, f*d).subs(values),
    sy.Eq(W, m*g).subs(values)
    ])

>>>    For nonlinear systems of equations, symbols should be
    given as a list so as to avoid ambiguity in the results.
    solve sorted the symbols as [d, g, m]
[(50, 100, 2)]


for ssolve function i am getting...

print ssolve('''
f=a*m
W=g*m
T=d*f
m=?
f=6.0
a=3.0
W=200
g=?
T=300
d=?
''')

raise DomainError("can't compute a Groebner basis over %s" % domain)
DomainError: can't compute a Groebner basis over RR

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