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a in (-oo:+oo)
a/6 = -3.2 // + 3.2
a/6+3.2 = 0
1/6*a+3.2 = 0 // - 3.2
1/6*a = -3.2 // : 1/6
a = -3.2/1/6
a = -19.19999962
a = -19.19999962
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