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a in (-oo:+oo)
(9*(5*a-7))/18 = (9*(a-1))/3 // - (9*(a-1))/3
(9*(5*a-7))/18-((9*(a-1))/3) = 0
(9*(5*a-7))/18-3*(a-1) = 0
(9*(5*a-7))/18+(-3*18*(a-1))/18 = 0
9*(5*a-7)-3*18*(a-1) = 0
-9*a-9 = 0
(-9*a-9)/18 = 0
(-9*a-9)/18 = 0 // * 18
-9*a-9 = 0
-9*a-9 = 0 // + 9
-9*a = 9 // : -9
a = 9/(-9)
a = -1
a = -1
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