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t in (-oo:+oo)
(2*t-5)/(-9) = 7 // - 7
(2*t-5)/(-9)-7 = 0
(2*t-5)/(-9)+(-9*(-7))/(-9) = 0
2*t-9*(-7)-5 = 0
2*t+58 = 0
(2*t+58)/(-9) = 0
(2*t+58)/(-9) = 0 // * -9
2*t+58 = 0
2*t+58 = 0 // - 58
2*t = -58 // : 2
t = -58/2
t = -29
t = -29
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