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z in (-oo:+oo)
z/4 = 6.5 // - 6.5
z/4-6.5 = 0
1/4*z-6.5 = 0 // + 6.5
1/4*z = 6.5 // : 1/4
z = 6.5/1/4
z = 26
z = 26
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