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