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t in (-oo:+oo)
(1/2)*t-4*t-7 = -21/5 // + -21/5
(1/2)*t-4*t-(-21/5)-7 = 0
(1/2)*t-4*t+21/5-7 = 0
-7/2*t-14/5 = 0 // + 14/5
-7/2*t = 14/5 // : -7/2
t = 14/5/(-7/2)
t = -4/5
t = -4/5
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