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x in (-oo:+oo)
(1/3)*x-(2/3) = -18 // + 18
(1/3)*x-(2/3)+18 = 0
(1/3)*x-2/3+18 = 0
1/3*x+52/3 = 0 // - 52/3
1/3*x = -52/3 // : 1/3
x = -52/3/1/3
x = -52
x = -52
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