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x in (-oo:+oo)
15-(2*x) = (2/3)*x // - (2/3)*x
15-(2*x)-((2/3)*x) = 0
(-2/3)*x-2*x+15 = 0
15-8/3*x = 0 // - 15
-8/3*x = -15 // : -8/3
x = -15/(-8/3)
x = 45/8
x = 45/8
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