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z in (-oo:+oo)
z/4+2 = 7-(z/4) // - 7-(z/4)
z/4+z/4-7+2 = 0
1/2*z-5 = 0 // + 5
1/2*z = 5 // : 1/2
z = 5/1/2
z = 10
z = 10
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