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a in (-oo:+oo)
19 = a/1.3 // - a/1.3
19-(a/1.3) = 0
19-0.76923077*a = 0
19-0.76923077*a = 0 // - 19
-0.76923077*a = -19 // : -0.76923077
a = -19/(-0.76923077)
a = 24.69999998
a = 24.69999998
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