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t in (-oo:+oo)
7*t-(5*t)+1 = 11 // - 11
7*t-(5*t)-11+1 = 0
7*t-5*t-11+1 = 0
2*t-10 = 0 // + 10
2*t = 10 // : 2
t = 10/2
t = 5
t = 5
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