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Simplifying 6 + -3z = 21 Solving 6 + -3z = 21 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -3z = 21 + -6 Combine like terms: 6 + -6 = 0 0 + -3z = 21 + -6 -3z = 21 + -6 Combine like terms: 21 + -6 = 15 -3z = 15 Divide each side by '-3'. z = -5 Simplifying z = -5
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