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z in (-oo:+oo)
z/5-4 = 8/4 // - 8/4
z/5-(8/4)-4 = 0
z/5-4-2 = 0
1/5*z-6 = 0 // + 6
1/5*z = 6 // : 1/5
z = 6/1/5
z = 30
z = 30
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