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x in (-oo:+oo)
(-1/2)*x-15 = 1/2-12 // - 1/2-12
(-1/2)*x-(1/2)-15+12 = 0
(-1/2)*x-1/2-15+12 = 0
-1/2*x-7/2 = 0 // + 7/2
-1/2*x = 7/2 // : -1/2
x = 7/2/(-1/2)
x = -7
x = -7
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