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z in (-oo:+oo)
z/5-5 = 21/4 // - 21/4
z/5-(21/4)-5 = 0
z/5-21/4-5 = 0
1/5*z-41/4 = 0 // + 41/4
1/5*z = 41/4 // : 1/5
z = 41/4/1/5
z = 205/4
z = 205/4
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