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x in (-oo:+oo)
100 = (1/2)*x // - (1/2)*x
100-((1/2)*x) = 0
(-1/2)*x+100 = 0
100-1/2*x = 0 // - 100
-1/2*x = -100 // : -1/2
x = -100/(-1/2)
x = 200
x = 200
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