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Simplifying 10z + 20 = z + -1 Reorder the terms: 20 + 10z = z + -1 Reorder the terms: 20 + 10z = -1 + z Solving 20 + 10z = -1 + 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. 20 + 10z + -1z = -1 + z + -1z Combine like terms: 10z + -1z = 9z 20 + 9z = -1 + z + -1z Combine like terms: z + -1z = 0 20 + 9z = -1 + 0 20 + 9z = -1 Add '-20' to each side of the equation. 20 + -20 + 9z = -1 + -20 Combine like terms: 20 + -20 = 0 0 + 9z = -1 + -20 9z = -1 + -20 Combine like terms: -1 + -20 = -21 9z = -21 Divide each side by '9'. z = -2.333333333 Simplifying z = -2.333333333
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