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Simplifying 5z + -21 = 2z Reorder the terms: -21 + 5z = 2z Solving -21 + 5z = 2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-2z' to each side of the equation. -21 + 5z + -2z = 2z + -2z Combine like terms: 5z + -2z = 3z -21 + 3z = 2z + -2z Combine like terms: 2z + -2z = 0 -21 + 3z = 0 Add '21' to each side of the equation. -21 + 21 + 3z = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3z = 0 + 21 3z = 0 + 21 Combine like terms: 0 + 21 = 21 3z = 21 Divide each side by '3'. z = 7 Simplifying z = 7
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