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x in (-oo:+oo)
1/2-2*x = -15/2 // + -15/2
1/2-2*x-(-15/2) = 0
1/2-2*x+15/2 = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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