YES

This TRS is terminating using the restricteddeltasimple interpretation 
g(delta7, X3) =  + 1*X3 + 0 + 3*X3*delta7 + 0*delta7
a(delta6) =  + 0 + 2*delta6
b(delta5) =  + 1 + 0*delta5
f(delta4, X2) =  + 0*X2 + 0 + 1*X2*delta4 + 0*delta4
g_tau_1(delta7) =  + 1(delta7/(1 + 3 * delta7))
f_tau_1(delta4) =  + 1(delta4/(0 + 1 * delta4))

Time: 0.027336 seconds
SUCCESS

Statistics:
Number of monomials: 30
Last formula building started for bound 3
Last SAT solving started for bound 3