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t in (-oo:+oo)
3*t-18 = 4*(-(3/4)-3) // - 4*(-(3/4)-3)
3*t-(4*(-(3/4)-3))-18 = 0
3*t-4*(-3/4-3)-18 = 0
3*t-3 = 0 // + 3
3*t = 3 // : 3
t = 3/3
t = 1
t = 1
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