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z in (-oo:+oo)
(7/9)*z+2*z+9 = 56 // - 56
(7/9)*z+2*z-56+9 = 0
25/9*z-47 = 0 // + 47
25/9*z = 47 // : 25/9
z = 47/25/9
z = 423/25
z = 423/25
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