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x in (-oo:+oo)
1200 = (1/2)*x // - (1/2)*x
1200-((1/2)*x) = 0
(-1/2)*x+1200 = 0
1200-1/2*x = 0 // - 1200
-1/2*x = -1200 // : -1/2
x = -1200/(-1/2)
x = 2400
x = 2400
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