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