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a in (-oo:+oo)
15-((1/6)*a) = -1 // + 1
1-((1/6)*a)+15 = 0
(-1/6)*a+1+15 = 0
16-1/6*a = 0 // - 16
-1/6*a = -16 // : -1/6
a = -16/(-1/6)
a = 96
a = 96
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