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z in (-oo:+oo)
z/4-7 = 5/2 // - 5/2
z/4-(5/2)-7 = 0
z/4-5/2-7 = 0
1/4*z-19/2 = 0 // + 19/2
1/4*z = 19/2 // : 1/4
z = 19/2/1/4
z = 38
z = 38
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