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t in (-oo:+oo)
2.4 = -t/4 // + -t/4
2.4-(-t/4) = 0
(1/4)*t+2.4 = 0
1/4*t+2.4 = 0 // - 2.4
1/4*t = -2.4 // : 1/4
t = -2.4/1/4
t = -9.6
t = -9.6
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