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Simplifying 13 = 21 + -4z Solving 13 = 21 + -4z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '4z' to each side of the equation. 13 + 4z = 21 + -4z + 4z Combine like terms: -4z + 4z = 0 13 + 4z = 21 + 0 13 + 4z = 21 Add '-13' to each side of the equation. 13 + -13 + 4z = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 4z = 21 + -13 4z = 21 + -13 Combine like terms: 21 + -13 = 8 4z = 8 Divide each side by '4'. z = 2 Simplifying z = 2
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