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t in (-oo:+oo)
t+6 = 7*t-42 // - 7*t-42
t-(7*t)+6+42 = 0
t-7*t+6+42 = 0
48-6*t = 0 // - 48
-6*t = -48 // : -6
t = -48/(-6)
t = 8
t = 8
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