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Simplifying -17 = z + -21 Reorder the terms: -17 = -21 + z Solving -17 = -21 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -17 + -1z = -21 + z + -1z Combine like terms: z + -1z = 0 -17 + -1z = -21 + 0 -17 + -1z = -21 Add '17' to each side of the equation. -17 + 17 + -1z = -21 + 17 Combine like terms: -17 + 17 = 0 0 + -1z = -21 + 17 -1z = -21 + 17 Combine like terms: -21 + 17 = -4 -1z = -4 Divide each side by '-1'. z = 4 Simplifying z = 4
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