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t in (-oo:+oo)
-21/10 = 7*t-(6*t)-3 // - 7*t-(6*t)-3
6*t-(7*t)-21/10+3 = 0
6*t-7*t-21/10+3 = 0
9/10-t = 0 // - 9/10
-t = -9/10 // * -1
t = 9/10
t = 9/10
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