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x in (-oo:+oo)
(0.01*x)/2 = 9 // - 9
(0.01*x)/2-9 = 0
0.005*x-9 = 0 // + 9
0.005*x = 9 // : 0.005
x = 9/0.005
x = 1800
x = 1800
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