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a in (-oo:+oo)
(1/3)*(a-(2/5))+(3/10)*(a+4/3) = 0
(1/3)*(a-2/5)+(3/10)*(a+4/3) = 0
1/3*(a-2/5)+3/10*(a+4/3) = 0
1/3*(a-2/5)+3/10*(a+4/3) = 0
19/30*a+4/15 = 0
19/30*a+4/15 = 0
19/30*a+4/15 = 0 // - 4/15
19/30*a = -4/15 // : 19/30
a = -4/15/19/30
a = -8/19
a = -8/19
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