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t in (-oo:+oo)
(t-10)/3+(t+5)/4 = 1/2 // - 1/2
(t-10)/3+(t+5)/4-(1/2) = 0
(t-10)/3+(t+5)/4-1/2 = 0
(2*4*(t-10))/(2*3*4)+(2*3*(t+5))/(2*3*4)+(-1*3*4)/(2*3*4) = 0
2*4*(t-10)+2*3*(t+5)-1*3*4 = 0
14*t-50-12 = 0
14*t-62 = 0
(14*t-62)/(2*3*4) = 0
(14*t-62)/(2*3*4) = 0 // * 2*3*4
14*t-62 = 0
14*t-62 = 0 // + 62
14*t = 62 // : 14
t = 62/14
t = 31/7
t = 31/7
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