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t in (-oo:+oo)
(3/4)*t+6 = -3/2 // + -3/2
(3/4)*t-(-3/2)+6 = 0
(3/4)*t+3/2+6 = 0
3/4*t+15/2 = 0 // - 15/2
3/4*t = -15/2 // : 3/4
t = -15/2/3/4
t = -10
t = -10
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