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t in (-oo:+oo)
(-1/4)*t-4 = -17/4 // + -17/4
(-1/4)*t-(-17/4)-4 = 0
(-1/4)*t+17/4-4 = 0
1/4-1/4*t = 0 // - 1/4
-1/4*t = -1/4 // : -1/4
t = -1/4/(-1/4)
t = 1
t = 1
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