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x in (-oo:+oo)
420*x = 5/6 // - 5/6
420*x-(5/6) = 0
420*x-5/6 = 0
420*x-5/6 = 0 // + 5/6
420*x = 5/6 // : 420
x = 5/6/420
x = 1/504
x = 1/504
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