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t in (-oo:+oo)
(-3/5)*t-6 = -321/50 // + -321/50
(-3/5)*t-(-321/50)-6 = 0
(-3/5)*t+321/50-6 = 0
21/50-3/5*t = 0 // - 21/50
-3/5*t = -21/50 // : -3/5
t = -21/50/(-3/5)
t = 7/10
t = 7/10
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