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t in (-oo:+oo)
9/10-t = 47/30 // - 47/30
9/10-t-(47/30) = 0
9/10-t-47/30 = 0
-t-2/3 = 0 // + 2/3
-t = 2/3 // * -1
t = -2/3
t = -2/3
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