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t in (-oo:+oo)
(1/2)*(6*t-7) = (t+7)/4 // - (t+7)/4
(1/2)*(6*t-7)-((t+7)/4) = 0
1/2*(6*t-7)+(-1*(t+7))/4 = 0
(1/2*4*(6*t-7))/4+(-1*(t+7))/4 = 0
1/2*4*(6*t-7)-1*(t+7) = 0
11*t-21 = 0
(11*t-21)/4 = 0
(11*t-21)/4 = 0 // * 4
11*t-21 = 0
11*t-21 = 0 // + 21
11*t = 21 // : 11
t = 21/11
t = 21/11
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