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t in (-oo:+oo)
6.4 = t/7.5 // - t/7.5
6.4-(t/7.5) = 0
6.4-0.13333333*t = 0
6.4-0.13333333*t = 0 // - 6.4
-0.13333333*t = -6.4 // : -0.13333333
t = -6.4/(-0.13333333)
t = 48.0000012
t = 48.0000012
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