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t in (-oo:+oo)
3*t-18 = 4*(3-((3/4)*t)) // - 4*(3-((3/4)*t))
3*t-(4*(3-((3/4)*t)))-18 = 0
3*t-4*((-3/4)*t+3)-18 = 0
3*t-4*(3-3/4*t)-18 = 0
3*t-4*(3-3/4*t)-18 = 0
6*t-18-12 = 0
6*t-30 = 0
6*t-30 = 0
6*t-30 = 0 // + 30
6*t = 30 // : 6
t = 30/6
t = 5
t = 5
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