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a in (-oo:+oo)
(1/5)*(a+5) = (1/9)*(4-a) // - (1/9)*(4-a)
(1/5)*(a+5)-((1/9)*(4-a)) = 0
(1/5)*(a+5)+(-1/9)*(4-a) = 0
1/5*(a+5)-1/9*(4-a) = 0
1/5*(a+5)-1/9*(4-a) = 0
14/45*a+5/9 = 0
14/45*a+5/9 = 0
14/45*a+5/9 = 0 // - 5/9
14/45*a = -5/9 // : 14/45
a = -5/9/14/45
a = -25/14
a = -25/14
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