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t in (-oo:+oo)
(1/2)*t-(9/10) = -49/60 // + -49/60
(1/2)*t-(9/10)-(-49/60) = 0
(1/2)*t-9/10+49/60 = 0
1/2*t-1/12 = 0 // + 1/12
1/2*t = 1/12 // : 1/2
t = 1/12/1/2
t = 1/6
t = 1/6
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