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x in (-oo:+oo)
(-0.5*x)/(-0.5) = -12/(-0.5) // + -12/(-0.5)
(-0.5*x)/(-0.5)-(-12/(-0.5)) = 0
(-0.5*x)/(-0.5)-24 = 0
x-24 = 0 // + 24
x = 24
x = 24
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