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a in (-oo:+oo)
3*(1/5-((3/10)*a))+2*a = (-2/5)*a-((1/10)*(a-3)) // - (-2/5)*a-((1/10)*(a-3))
3*(1/5-((3/10)*a))+(1/10)*(a-3)+2*a-((-2/5)*a) = 0
3*((-3/10)*a+1/5)+(1/10)*(a-3)+2*a+(2/5)*a = 0
3*(1/5-3/10*a)+1/10*(a-3)+2*a+(2*a)/5 = 0
(3*5*(1/5-3/10*a))/5+(1/10*5*(a-3))/5+(2*5*a)/5+(2*a)/5 = 0
3*5*(1/5-3/10*a)+1/10*5*(a-3)+2*5*a+2*a = 0
10*a-4*a+2*a+3/2 = 0
6*a+2*a+3/2 = 0
8*a+3/2 = 0
(8*a+3/2)/5 = 0
(8*a+3/2)/5 = 0 // * 5
8*a+3/2 = 0
8*a+3/2 = 0 // - 3/2
8*a = -3/2 // : 8
a = -3/2/8
a = -3/16
a = -3/16
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