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t in (-oo:+oo)
8 = t/4.7 // - t/4.7
8-(t/4.7) = 0
8-0.21276596*t = 0
8-0.21276596*t = 0 // - 8
-0.21276596*t = -8 // : -0.21276596
t = -8/(-0.21276596)
t = 37.59999955
t = 37.59999955
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