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t in (-oo:+oo)
(1/8)*(9*t-8) = (9/8)*t-t-(8/4) // - (9/8)*t-t-(8/4)
(1/8)*(9*t-8)-((9/8)*t)+t+8/4 = 0
(1/8)*(9*t-8)+(-9/8)*t+t+8/4 = 0
1/8*(9*t-8)+(-9*t)/8+t+2 = 0
(1/8*8*(9*t-8))/8+(-9*t)/8+(8*t)/8+(2*8)/8 = 0
1/8*8*(9*t-8)-9*t+8*t+2*8 = 0
8*t-8+16 = 0
8*t+8 = 0
(8*t+8)/8 = 0
(8*t+8)/8 = 0 // * 8
8*t+8 = 0
8*t+8 = 0 // - 8
8*t = -8 // : 8
t = -8/8
t = -1
t = -1
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