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t in (-oo:+oo)
t/7 = -9/1 // + -9/1
t/7-(-9/1) = 0
t/7+9 = 0
1/7*t+9 = 0 // - 9
1/7*t = -9 // : 1/7
t = -9/1/7
t = -63
t = -63
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