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t in (-oo:+oo)
4*t+1/9 = t+t+7/18-(5/18) // - t+t+7/18-(5/18)
4*t-t-t+1/9-(7/18)+5/18 = 0
4*t-t-t+1/9-7/18+5/18 = 0
2*t = 0 // : 2
t = 0
t = 0
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