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t in (-oo:+oo)
6*(7*t-3) = -522 // + 522
6*(7*t-3)+522 = 0
6*(7*t-3)+522 = 0
42*t+504 = 0
42*t+504 = 0
42*t+504 = 0 // - 504
42*t = -504 // : 42
t = -504/42
t = -12
t = -12
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