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t in (-oo:+oo)
6*t+(7/4)*t-1 = 3*t+(8/2)*t-4 // - 3*t+(8/2)*t-4
6*t+(7/4)*t-(3*t)-((8/2)*t)-1+4 = 0
6*t+(7/4)*t-3*t-4*t-1+4 = 0
3/4*t+3 = 0 // - 3
3/4*t = -3 // : 3/4
t = -3/3/4
t = -4
t = -4
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