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t in (-oo:+oo)
3 = 5*t-7*t+1 // - 5*t-7*t+1
3-(-7*t)-(5*t)-1 = 0
7*t-5*t-1+3 = 0
2*t+2 = 0 // - 2
2*t = -2 // : 2
t = -2/2
t = -1
t = -1
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