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x in (-oo:+oo)
x/7 = 8/200 // - 8/200
x/7-(8/200) = 0
x/7-1/25 = 0
1/7*x-1/25 = 0 // + 1/25
1/7*x = 1/25 // : 1/7
x = 1/25/1/7
x = 7/25
x = 7/25
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