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t in (-oo:+oo)
-((9/3)*t) = t*((3*t+8)/15)+(5/3)*t // - t*((3*t+8)/15)+(5/3)*t
-(t*((3*t+8)/15))-((9/3)*t)-((5/3)*t) = 0
(-5/3)*t-(t*((3*t+8)/15))-3*t = 0
(-1*t*(3*t+8))/15-3*t+(-5*t)/3 = 0
(-1*3*t*(3*t+8))/(3*15)+(-3*3*15*t)/(3*15)+(-5*15*t)/(3*15) = 0
-1*3*t*(3*t+8)-3*3*15*t-5*15*t = 0
-9*t^2-159*t-75*t = 0
-9*t^2-234*t = 0
-9*t^2-234*t = 0
-9*t*(t+26) = 0
t+26 = 0 // - 26
t = -26
-9*t*(t+26) = 0
(-9*t*(t+26))/(3*15) = 0
(-9*t*(t+26))/(3*15) = 0 // * 3*15
-9*t*(t+26) = 0
( -9*t )
-9*t = 0 // : -9
t = 0
( t+26 )
t+26 = 0 // - 26
t = -26
t in { 0, -26 }
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