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t in (-oo:+oo)
(-1/2)*t-(7*t)+10 = -25/2 // + -25/2
(-1/2)*t-(7*t)-(-25/2)+10 = 0
(-1/2)*t-7*t+25/2+10 = 0
45/2-15/2*t = 0 // - 45/2
-15/2*t = -45/2 // : -15/2
t = -45/2/(-15/2)
t = 3
t = 3
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