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t in (-oo:+oo)
48 = 4*t+2*t+6 // - 4*t+2*t+6
48-(4*t)-(2*t)-6 = 0
48-4*t-2*t-6 = 0
42-6*t = 0 // - 42
-6*t = -42 // : -6
t = -42/(-6)
t = 7
t = 7
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