It is 20z-18 when simplified
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It works out that: z = -32
(5z + 9)(3z - 2)
(5z - 3)(z - 3)
Without an equality sign and not knowing the plus or minus value of 81 it can't be solved. If you mean: z+81 = 9z-7 Then: z-9z = -7-81 => -8z = -88 By dividing both sides by -8: z = 11
Add together like terms: 8z-3y