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x in (-oo:+oo)
3*((-2/3)*x+15) = 7-2*x // - 7-2*x
3*((-2/3)*x+15)-(-2*x)-7 = 0
3*((-2/3)*x+15)+2*x-7 = 0
3*(15-2/3*x)+2*x-7 = 0
3*(15-2/3*x)+2*x-7 = 0
45-7 = 0
38 = 0
38 = 0
x belongs to the empty set
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