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t in (-oo:+oo)
7*t-(3*t)-6 = 18 // - 18
7*t-(3*t)-18-6 = 0
7*t-3*t-18-6 = 0
4*t-24 = 0 // + 24
4*t = 24 // : 4
t = 24/4
t = 6
t = 6
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