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x in (-oo:+oo)
1/2-(2*x) = 15 // - 15
1/2-(2*x)-15 = 0
1/2-2*x-15 = 0
-2*x-29/2 = 0 // + 29/2
-2*x = 29/2 // : -2
x = 29/2/(-2)
x = -29/4
x = -29/4
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