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Simplifying 3z + -15 = -21 + z Reorder the terms: -15 + 3z = -21 + z Solving -15 + 3z = -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. -15 + 3z + -1z = -21 + z + -1z Combine like terms: 3z + -1z = 2z -15 + 2z = -21 + z + -1z Combine like terms: z + -1z = 0 -15 + 2z = -21 + 0 -15 + 2z = -21 Add '15' to each side of the equation. -15 + 15 + 2z = -21 + 15 Combine like terms: -15 + 15 = 0 0 + 2z = -21 + 15 2z = -21 + 15 Combine like terms: -21 + 15 = -6 2z = -6 Divide each side by '2'. z = -3 Simplifying z = -3
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