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a in (-oo:+oo)
a-((3*(a-5))/10)-(3/6) = 5*a+10/5 // - 5*a+10/5
a-((3*(a-5))/10)-(5*a)-(3/6)-(10/5) = 0
(-3/10)*(a-5)+a-5*a-1/2-2 = 0
a-3/10*(a-5)-5*a-1/2-2 = 0
(-3/10*2*(a-5))/2+(2*a)/2+(-5*2*a)/2-1/2+(-2*2)/2 = 0
2*a-3/10*2*(a-5)-5*2*a-2*2-1 = 0
7/5*a-10*a-4-1+3 = 0
3-43/5*a-4-1 = 0
2-43/5*a-4 = 0
-43/5*a-2 = 0
(-43/5*a-2)/2 = 0
(-43/5*a-2)/2 = 0 // * 2
-43/5*a-2 = 0
-43/5*a-2 = 0 // + 2
-43/5*a = 2 // : -43/5
a = 2/(-43/5)
a = -10/43
a = -10/43
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