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x in (-oo:+oo)
(2/3)*(15-(9*x))-((3/4)*(12-(8*x))) = 0
(2/3)*(15-9*x)+(-3/4)*(12-8*x) = 0
2/3*(15-9*x)-3/4*(12-8*x) = 0
2/3*(15-9*x)-3/4*(12-8*x) = 0
1 = 0
1 = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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