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a in (-oo:+oo)
(a-3)/6+(a-1)/10-3 = (2*a+1)/5 // - (2*a+1)/5
(a-3)/6+(a-1)/10-((2*a+1)/5)-3 = 0
(a-3)/6+(a-1)/10+(-1*(2*a+1))/5-3 = 0
(5*10*(a-3))/(5*6*10)+(5*6*(a-1))/(5*6*10)+(-1*6*10*(2*a+1))/(5*6*10)+(-3*5*6*10)/(5*6*10) = 0
5*10*(a-3)+5*6*(a-1)-1*6*10*(2*a+1)-3*5*6*10 = 0
80*a-120*a-900-180-60 = 0
-40*a-900-240 = 0
-40*a-1140 = 0
(-40*a-1140)/(5*6*10) = 0
(-40*a-1140)/(5*6*10) = 0 // * 5*6*10
-40*a-1140 = 0
-40*a-1140 = 0 // + 1140
-40*a = 1140 // : -40
a = 1140/(-40)
a = -57/2
a = -57/2
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