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x in (-oo:+oo)
(2/3)*x-3 = -18 // + 18
(2/3)*x-3+18 = 0
2/3*x+15 = 0 // - 15
2/3*x = -15 // : 2/3
x = -15/2/3
x = -45/2
x = -45/2
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