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a in (-oo:+oo)
-a/1.6 = 7.5 // - 7.5
-a/1.6-7.5 = 0
-0.625*a-7.5 = 0 // + 7.5
-0.625*a = 7.5 // : -0.625
a = 7.5/(-0.625)
a = -12
a = -12
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