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x in (-oo:+oo)
16*x = 1/7 // - 1/7
16*x-(1/7) = 0
16*x-1/7 = 0
16*x-1/7 = 0 // + 1/7
16*x = 1/7 // : 16
x = 1/7/16
x = 1/112
x = 1/112
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