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