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t in (-oo:+oo)
(5/7)*(t-(3/5)) = 2.75 // - 2.75
(5/7)*(t-(3/5))-2.75 = 0
(5/7)*(t-3/5)-2.75 = 0
5/7*(t-3/5)-2.75 = 0
5/7*(t-3/5)-2.75 = 0
5/7*t-3.17857143 = 0
5/7*t-3.17857143 = 0
5/7*t-3.17857143 = 0 // + 3.17857143
5/7*t = 3.17857143 // : 5/7
t = 3.17857143/5/7
t = 4.45000003
t = 4.45000003
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