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x in (-oo:+oo)
4*x = 1/7 // - 1/7
4*x-(1/7) = 0
4*x-1/7 = 0
4*x-1/7 = 0 // + 1/7
4*x = 1/7 // : 4
x = 1/7/4
x = 1/28
x = 1/28
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