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a in (-oo:+oo)
(6*a-5)/6+(4*a-5)/4+(8*a+9)/12 = 4 // - 4
(6*a-5)/6+(4*a-5)/4+(8*a+9)/12-4 = 0
(4*12*(6*a-5))/(4*6*12)+(6*12*(4*a-5))/(4*6*12)+(4*6*(8*a+9))/(4*6*12)+(-4*4*6*12)/(4*6*12) = 0
4*12*(6*a-5)+6*12*(4*a-5)+4*6*(8*a+9)-4*4*6*12 = 0
576*a+192*a-1152-600+216 = 0
768*a-1152-384 = 0
768*a-1536 = 0
(768*a-1536)/(4*6*12) = 0
(768*a-1536)/(4*6*12) = 0 // * 4*6*12
768*a-1536 = 0
768*a-1536 = 0 // + 1536
768*a = 1536 // : 768
a = 1536/768
a = 2
a = 2
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