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t in (-oo:+oo)
(1/2)*t+7.5 = (3/4)*t // - (3/4)*t
(1/2)*t-((3/4)*t)+7.5 = 0
(1/2)*t+(-3/4)*t+7.5 = 0
7.5-1/4*t = 0 // - 7.5
-1/4*t = -7.5 // : -1/4
t = -7.5/(-1/4)
t = 30
t = 30
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