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t in (-oo:+oo)
4*t-(7*t)+4 = 40 // - 40
4*t-(7*t)-40+4 = 0
4*t-7*t-40+4 = 0
-3*t-36 = 0 // + 36
-3*t = 36 // : -3
t = 36/(-3)
t = -12
t = -12
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