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t in (-oo:+oo)
4*(6-(5*t)) = 84 // - 84
4*(6-(5*t))-84 = 0
4*(6-5*t)-84 = 0
4*(6-5*t)-84 = 0
-20*t-60 = 0
-20*t-60 = 0
-20*t-60 = 0 // + 60
-20*t = 60 // : -20
t = 60/(-20)
t = -3
t = -3
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