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Simplifying 7 + -21 + -3 = 2z Combine like terms: 7 + -21 = -14 -14 + -3 = 2z Combine like terms: -14 + -3 = -17 -17 = 2z Solving -17 = 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. -17 + -2z = 2z + -2z Combine like terms: 2z + -2z = 0 -17 + -2z = 0 Add '17' to each side of the equation. -17 + 17 + -2z = 0 + 17 Combine like terms: -17 + 17 = 0 0 + -2z = 0 + 17 -2z = 0 + 17 Combine like terms: 0 + 17 = 17 -2z = 17 Divide each side by '-2'. z = -8.5 Simplifying z = -8.5
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