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Simplifying -18 + 2 = z + 7z Combine like terms: -18 + 2 = -16 -16 = z + 7z Combine like terms: z + 7z = 8z -16 = 8z Solving -16 = 8z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-8z' to each side of the equation. -16 + -8z = 8z + -8z Combine like terms: 8z + -8z = 0 -16 + -8z = 0 Add '16' to each side of the equation. -16 + 16 + -8z = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -8z = 0 + 16 -8z = 0 + 16 Combine like terms: 0 + 16 = 16 -8z = 16 Divide each side by '-8'. z = -2 Simplifying z = -2
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