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t in (-oo:+oo)
(1/9)*(9*t-7) = (10/9)*t-t+7/18 // - (10/9)*t-t+7/18
(1/9)*(9*t-7)-((10/9)*t)+t-(7/18) = 0
(1/9)*(9*t-7)+(-10/9)*t+t-7/18 = 0
1/9*(9*t-7)+(-10*t)/9+t-7/18 = 0
(1/9*9*18*(9*t-7))/(9*18)+(-10*18*t)/(9*18)+(9*18*t)/(9*18)+(-7*9)/(9*18) = 0
1/9*9*18*(9*t-7)-10*18*t+9*18*t-7*9 = 0
162*t-18*t-126-63 = 0
144*t-126-63 = 0
144*t-189 = 0
(144*t-189)/(9*18) = 0
(144*t-189)/(9*18) = 0 // * 9*18
144*t-189 = 0
144*t-189 = 0 // + 189
144*t = 189 // : 144
t = 189/144
t = 21/16
t = 21/16
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