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t in (-oo:+oo)
7*t-(5*t)+8 = 26 // - 26
7*t-(5*t)-26+8 = 0
7*t-5*t-26+8 = 0
2*t-18 = 0 // + 18
2*t = 18 // : 2
t = 18/2
t = 9
t = 9
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