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a in (-oo:+oo)
9*a+19/2 = -((3/2)*(-6*a-3))-3*a // + -((3/2)*(-6*a-3))-3*a
(3/2)*(-6*a-3)+9*a-(-3*a)+19/2 = 0
(3/2)*(-6*a-3)+9*a+3*a+19/2 = 0
3/2*(-6*a-3)+9*a+3*a+19/2 = 0
(3/2*2*(-6*a-3))/2+(2*9*a)/2+(2*3*a)/2+19/2 = 0
3/2*2*(-6*a-3)+2*9*a+2*3*a+19 = 0
6*a-9+19 = 0
6*a+10 = 0
(6*a+10)/2 = 0
(6*a+10)/2 = 0 // * 2
6*a+10 = 0
6*a+10 = 0 // - 10
6*a = -10 // : 6
a = -10/6
a = -5/3
a = -5/3
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