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a in (-oo:+oo)
a-((3*(a-3))/10)-(5/6) = 2*a+2/5 // - 2*a+2/5
a-((3*(a-3))/10)-(2*a)-(5/6)-(2/5) = 0
(-3/10)*(a-3)+a-2*a-5/6-2/5 = 0
a-3/10*(a-3)-2*a-5/6-2/5 = 0
(-3/10*5*6*(a-3))/(5*6)+(5*6*a)/(5*6)+(-2*5*6*a)/(5*6)+(-5*5)/(5*6)+(-2*6)/(5*6) = 0
5*6*a-3/10*5*6*(a-3)-2*5*6*a-5*5-2*6 = 0
21*a-60*a-25-12+27 = 0
27-39*a-25-12 = 0
2-39*a-12 = 0
-39*a-10 = 0
(-39*a-10)/(5*6) = 0
(-39*a-10)/(5*6) = 0 // * 5*6
-39*a-10 = 0
-39*a-10 = 0 // + 10
-39*a = 10 // : -39
a = 10/(-39)
a = -10/39
a = -10/39
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