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t in (-oo:+oo)
(-7/5)*(t-15)-((1/2)*t) = 0
(-7/5)*(t-15)+(-1/2)*t = 0
-7/5*(t-15)-t/2 = 0
(-7/5*2*(t-15))/2-t/2 = 0
-7/5*2*(t-15)-t = 0
42-19/5*t = 0
(42-19/5*t)/2 = 0
(42-19/5*t)/2 = 0 // * 2
42-19/5*t = 0
42-19/5*t = 0 // - 42
-19/5*t = -42 // : -19/5
t = -42/(-19/5)
t = 210/19
t = 210/19
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