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a in (-oo:+oo)
-a/(-8) = 3.6 // - 3.6
-a/(-8)-3.6 = 0
1/8*a-3.6 = 0 // + 3.6
1/8*a = 3.6 // : 1/8
a = 3.6/1/8
a = 28.8
a = 28.8
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