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x in (-oo:+oo)
(x-4)/9 = 7/18 // - 7/18
(x-4)/9-(7/18) = 0
(x-4)/9-7/18 = 0
(18*(x-4))/(9*18)+(-7*9)/(9*18) = 0
18*(x-4)-7*9 = 0
18*x-135 = 0
(18*x-135)/(9*18) = 0
(18*x-135)/(9*18) = 0 // * 9*18
18*x-135 = 0
18*x-135 = 0 // + 135
18*x = 135 // : 18
x = 135/18
x = 15/2
x = 15/2
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