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z in (-oo:+oo)
z/5-4 = 9/8 // - 9/8
z/5-(9/8)-4 = 0
z/5-9/8-4 = 0
1/5*z-41/8 = 0 // + 41/8
1/5*z = 41/8 // : 1/5
z = 41/8/1/5
z = 205/8
z = 205/8
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