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t in (-oo:+oo)
(-9/10)*t = 7/8 // - 7/8
(-9/10)*t-(7/8) = 0
(-9/10)*t-7/8 = 0
-9/10*t-7/8 = 0 // + 7/8
-9/10*t = 7/8 // : -9/10
t = 7/8/(-9/10)
t = -35/36
t = -35/36
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