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t in (-oo:+oo)
(-1/5)*t+3 = 14/5 // - 14/5
(-1/5)*t-(14/5)+3 = 0
(-1/5)*t-14/5+3 = 0
1/5-1/5*t = 0 // - 1/5
-1/5*t = -1/5 // : -1/5
t = -1/5/(-1/5)
t = 1
t = 1
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