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t in (-oo:+oo)
(-7/9)*t = -28/36 // + -28/36
(-7/9)*t-(-28/36) = 0
(-7/9)*t+7/9 = 0
7/9-7/9*t = 0 // - 7/9
-7/9*t = -7/9 // : -7/9
t = -7/9/(-7/9)
t = 1
t = 1
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