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t in (-oo:+oo)
9.4 = -t/2.5 // + -t/2.5
9.4-(-t/2.5) = 0
0.4*t+9.4 = 0
0.4*t+9.4 = 0 // - 9.4
0.4*t = -9.4 // : 0.4
t = -9.4/0.4
t = -23.5
t = -23.5
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