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