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t in (-oo:+oo)
(4/7)*t-5 = -100/21 // + -100/21
(4/7)*t-(-100/21)-5 = 0
(4/7)*t+100/21-5 = 0
4/7*t-5/21 = 0 // + 5/21
4/7*t = 5/21 // : 4/7
t = 5/21/4/7
t = 5/12
t = 5/12
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