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t in (-oo:+oo)
39 = 7-3*t-(5*t) // - 7-3*t-(5*t)
5*t-(-3*t)-7+39 = 0
3*t+5*t-7+39 = 0
8*t+32 = 0 // - 32
8*t = -32 // : 8
t = -32/8
t = -4
t = -4
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