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x in (-oo:+oo)
-75 = (1/2)*x // - (1/2)*x
-((1/2)*x)-75 = 0
(-1/2)*x-75 = 0
-1/2*x-75 = 0 // + 75
-1/2*x = 75 // : -1/2
x = 75/(-1/2)
x = -150
x = -150
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