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x in (-oo:+oo)
x-(100/7) = 1.9 // - 1.9
x-(100/7)-1.9 = 0
x-100/7-1.9 = 0
x-16.18571429 = 0 // + 16.18571429
x = 16.18571429
x = 16.18571429
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