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z in (-oo:+oo)
z/5-7 = 7/3 // - 7/3
z/5-(7/3)-7 = 0
z/5-7/3-7 = 0
1/5*z-28/3 = 0 // + 28/3
1/5*z = 28/3 // : 1/5
z = 28/3/1/5
z = 140/3
z = 140/3
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