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x in (-oo:+oo)
(1/3)*(27*x-18) = -12 // + 12
(1/3)*(27*x-18)+12 = 0
1/3*(27*x-18)+12 = 0
1/3*(27*x-18)+12 = 0
9*x+6 = 0
9*x+6 = 0
9*x+6 = 0 // - 6
9*x = -6 // : 9
x = -6/9
x = -2/3
x = -2/3
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