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x in (-oo:+oo)
x/200 = 0.15 // - 0.15
x/200-0.15 = 0
1/200*x-0.15 = 0 // + 0.15
1/200*x = 0.15 // : 1/200
x = 0.15/1/200
x = 30
x = 30
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