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x in (-oo:+oo)
(x-30)/18 = 26/8 // - 26/8
(x-30)/18-(26/8) = 0
(x-30)/18-13/4 = 0
(4*(x-30))/(4*18)+(-13*18)/(4*18) = 0
4*(x-30)-13*18 = 0
4*x-354 = 0
(4*x-354)/(4*18) = 0
(4*x-354)/(4*18) = 0 // * 4*18
4*x-354 = 0
4*x-354 = 0 // + 354
4*x = 354 // : 4
x = 354/4
x = 177/2
x = 177/2
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