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t in (-oo:+oo)
48 = 3*t+6*t+3 // - 3*t+6*t+3
48-(3*t)-(6*t)-3 = 0
48-3*t-6*t-3 = 0
45-9*t = 0 // - 45
-9*t = -45 // : -9
t = -45/(-9)
t = 5
t = 5
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