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t in (-oo:+oo)
19.8-((4*t)/3) = 8.7 // - 8.7
19.8-((4*t)/3)-8.7 = 0
(-4/3)*t-8.7+19.8 = 0
11.1-4/3*t = 0 // - 11.1
-4/3*t = -11.1 // : -4/3
t = -11.1/(-4/3)
t = 8.32500002
t = 8.32500002
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