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z in (-oo:+oo)
z/7 = 16/56 // - 16/56
z/7-(16/56) = 0
z/7-2/7 = 0
1/7*z-2/7 = 0 // + 2/7
1/7*z = 2/7 // : 1/7
z = 2/7/1/7
z = 2
z = 2
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