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a in (-oo:+oo)
1-(15*(a+5)) = (1/9)*(4-a) // - (1/9)*(4-a)
1-(15*(a+5))-((1/9)*(4-a)) = 0
(-1/9)*(4-a)-15*(a+5)+1 = 0
1-15*(a+5)-1/9*(4-a) = 0
1-15*(a+5)-1/9*(4-a) = 0
1-134/9*a-679/9 = 0
-134/9*a-670/9 = 0
-134/9*a-670/9 = 0
-134/9*a-670/9 = 0 // + 670/9
-134/9*a = 670/9 // : -134/9
a = 670/9/(-134/9)
a = -5
a = -5
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