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t in (-oo:+oo)
(-2/5)*t = 7 // - 7
(-2/5)*t-7 = 0
-2/5*t-7 = 0 // + 7
-2/5*t = 7 // : -2/5
t = 7/(-2/5)
t = -35/2
t = -35/2
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