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t in (-oo:+oo)
(-7/9)*t = 28/32 // - 28/32
(-7/9)*t-(28/32) = 0
(-7/9)*t-7/8 = 0
-7/9*t-7/8 = 0 // + 7/8
-7/9*t = 7/8 // : -7/9
t = 7/8/(-7/9)
t = -9/8
t = -9/8
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