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t in (-oo:+oo)
6*(4*t-5) = 42 // - 42
6*(4*t-5)-42 = 0
6*(4*t-5)-42 = 0
24*t-72 = 0
24*t-72 = 0
24*t-72 = 0 // + 72
24*t = 72 // : 24
t = 72/24
t = 3
t = 3
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