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t in (-oo:+oo)
t+(3/4)*t-(7/2) = (-7/8)*(t-(2/7)) // - (-7/8)*(t-(2/7))
t-((-7/8)*(t-(2/7)))+(3/4)*t-(7/2) = 0
(7/8)*(t-2/7)+t+(3/4)*t-7/2 = 0
7/8*(t-2/7)+t+(3*t)/4-7/2 = 0
(7/8*2*4*(t-2/7))/(2*4)+(2*4*t)/(2*4)+(2*3*t)/(2*4)+(-7*4)/(2*4) = 0
7/8*2*4*(t-2/7)+2*4*t+2*3*t-7*4 = 0
15*t+6*t-28-2 = 0
21*t-28-2 = 0
21*t-30 = 0
(21*t-30)/(2*4) = 0
(21*t-30)/(2*4) = 0 // * 2*4
21*t-30 = 0
21*t-30 = 0 // + 30
21*t = 30 // : 21
t = 30/21
t = 10/7
t = 10/7
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