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t in (-oo:+oo)
(-7/10)*t = 9/8 // - 9/8
(-7/10)*t-(9/8) = 0
(-7/10)*t-9/8 = 0
-7/10*t-9/8 = 0 // + 9/8
-7/10*t = 9/8 // : -7/10
t = 9/8/(-7/10)
t = -45/28
t = -45/28
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