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Simplifying 13 = z + 4 Reorder the terms: 13 = 4 + z Solving 13 = 4 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. 13 + -1z = 4 + z + -1z Combine like terms: z + -1z = 0 13 + -1z = 4 + 0 13 + -1z = 4 Add '-13' to each side of the equation. 13 + -13 + -1z = 4 + -13 Combine like terms: 13 + -13 = 0 0 + -1z = 4 + -13 -1z = 4 + -13 Combine like terms: 4 + -13 = -9 -1z = -9 Divide each side by '-1'. z = 9 Simplifying z = 9
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