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a in (-oo:+oo)
(1/15)*(a+15) = (1/9)*(4-a) // - (1/9)*(4-a)
(1/15)*(a+15)-((1/9)*(4-a)) = 0
(1/15)*(a+15)+(-1/9)*(4-a) = 0
1/15*(a+15)-1/9*(4-a) = 0
1/15*(a+15)-1/9*(4-a) = 0
8/45*a+5/9 = 0
8/45*a+5/9 = 0
8/45*a+5/9 = 0 // - 5/9
8/45*a = -5/9 // : 8/45
a = -5/9/8/45
a = -25/8
a = -25/8
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