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x in (-oo:+oo)
(1/2)*x = (2/3)*x-15 // - (2/3)*x-15
(1/2)*x-((2/3)*x)+15 = 0
(1/2)*x+(-2/3)*x+15 = 0
15-1/6*x = 0 // - 15
-1/6*x = -15 // : -1/6
x = -15/(-1/6)
x = 90
x = 90
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