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z in (-oo:+oo)
z/4-7 = 5.2 // - 5.2
z/4-7-5.2 = 0
1/4*z-12.2 = 0 // + 12.2
1/4*z = 12.2 // : 1/4
z = 12.2/1/4
z = 48.8
z = 48.8
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