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t in (-oo:+oo)
6*t+(3/4)*t-7 = 3*t+(7/2)*t-5 // - 3*t+(7/2)*t-5
6*t+(3/4)*t-(3*t)-((7/2)*t)-7+5 = 0
6*t+(3/4)*t-3*t+(-7/2)*t-7+5 = 0
1/4*t-2 = 0 // + 2
1/4*t = 2 // : 1/4
t = 2/1/4
t = 8
t = 8
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