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x in (-oo:+oo)
(1/2)*x+15 = 8*x // - 8*x
(1/2)*x-(8*x)+15 = 0
(1/2)*x-8*x+15 = 0
15-15/2*x = 0 // - 15
-15/2*x = -15 // : -15/2
x = -15/(-15/2)
x = 2
x = 2
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