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t in (-oo:+oo)
19.8-((4*t)/5) = 6 // - 6
19.8-((4*t)/5)-6 = 0
(-4/5)*t-6+19.8 = 0
13.8-4/5*t = 0 // - 13.8
-4/5*t = -13.8 // : -4/5
t = -13.8/(-4/5)
t = 17.25
t = 17.25
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