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z in (-oo:+oo)
z/4+z/2+30 = 180 // - 180
z/4+z/2-180+30 = 0
3/4*z-150 = 0 // + 150
3/4*z = 150 // : 3/4
z = 150/3/4
z = 200
z = 200
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