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x in (-oo:+oo)
x-((2*x)/(-3))+12 = -3 // + 3
x-((2*x)/(-3))+3+12 = 0
(2/3)*x+x+3+12 = 0
5/3*x+15 = 0 // - 15
5/3*x = -15 // : 5/3
x = -15/5/3
x = -9
x = -9
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