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t in (-oo:+oo)
3/5-(1/10) = t-(5/2) // - t-(5/2)
3/5-t-(1/10)+5/2 = 0
3/5-t-1/10+5/2 = 0
3-t = 0 // - 3
-t = -3 // * -1
t = 3
t = 3
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