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a in (-oo:+oo)
(1/15)*(a+2) = 1-(6*(2-a)) // - 1-(6*(2-a))
(1/15)*(a+2)+6*(2-a)-1 = 0
1/15*(a+2)+6*(2-a)-1 = 0
1/15*(a+2)+6*(2-a)-1 = 0
182/15-89/15*a-1 = 0
167/15-89/15*a = 0
167/15-89/15*a = 0
167/15-89/15*a = 0 // - 167/15
-89/15*a = -167/15 // : -89/15
a = -167/15/(-89/15)
a = 167/89
a = 167/89
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