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t in (-oo:+oo)
4*t-(5*t)-3 = 7 // - 7
4*t-(5*t)-7-3 = 0
4*t-5*t-7-3 = 0
-t-10 = 0 // + 10
-t = 10 // * -1
t = -10
t = -10
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