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x in (-oo:+oo)
(2/3)*(15-(6*x)) = 15 // - 15
(2/3)*(15-(6*x))-15 = 0
(2/3)*(15-6*x)-15 = 0
2/3*(15-6*x)-15 = 0
2/3*(15-6*x)-15 = 0
-4*x-5 = 0
-4*x-5 = 0
-4*x-5 = 0 // + 5
-4*x = 5 // : -4
x = 5/(-4)
x = -5/4
x = -5/4
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