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t in (-oo:+oo)
(-3/5)*t+8 = 397/50 // - 397/50
(-3/5)*t-(397/50)+8 = 0
(-3/5)*t-397/50+8 = 0
3/50-3/5*t = 0 // - 3/50
-3/5*t = -3/50 // : -3/5
t = -3/50/(-3/5)
t = 1/10
t = 1/10
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