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Simplifying 21 = 7 + 2z Solving 21 = 7 + 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 + -2z = 7 + 2z + -2z Combine like terms: 2z + -2z = 0 21 + -2z = 7 + 0 21 + -2z = 7 Add '-21' to each side of the equation. 21 + -21 + -2z = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2z = 7 + -21 -2z = 7 + -21 Combine like terms: 7 + -21 = -14 -2z = -14 Divide each side by '-2'. z = 7 Simplifying z = 7
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