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z in (-oo:+oo)
z/5-7 = 9/4 // - 9/4
z/5-(9/4)-7 = 0
z/5-9/4-7 = 0
1/5*z-37/4 = 0 // + 37/4
1/5*z = 37/4 // : 1/5
z = 37/4/1/5
z = 185/4
z = 185/4
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