3d^2y/dx^2+dy/dx-14y=0 ; y=(0) ,y'=(0)=-1
"3y''+y'-14y=0,"
"y=c_1e^{-\\frac{7x}3}+c_2e^{2x},"
"y(0)=0: c_1=-c_2,"
"y'(0)=-1: c_2=\\frac 76 c_1-\\frac 12,"
"c_1=\\frac3{13},~c_2=-\\frac 3{13},"
"y=\\frac 3{13}e^{-\\frac{7x}3}-\\frac 3{13}e^{2x}."
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