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t in (-oo:+oo)
(1/4)*(t+9) = 47 // - 47
(1/4)*(t+9)-47 = 0
1/4*(t+9)-47 = 0
1/4*(t+9)-47 = 0
1/4*t-179/4 = 0
1/4*t-179/4 = 0
1/4*t-179/4 = 0 // + 179/4
1/4*t = 179/4 // : 1/4
t = 179/4/1/4
t = 179
t = 179
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