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z in (-oo:+oo)
z/6+4 = 7-(z/6) // - 7-(z/6)
z/6+z/6-7+4 = 0
1/3*z-3 = 0 // + 3
1/3*z = 3 // : 1/3
z = 3/1/3
z = 9
z = 9
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