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Simplifying 21 + -1(z + 1) = 39 Reorder the terms: 21 + -1(1 + z) = 39 21 + (1 * -1 + z * -1) = 39 21 + (-1 + -1z) = 39 Combine like terms: 21 + -1 = 20 20 + -1z = 39 Solving 20 + -1z = 39 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1z = 39 + -20 Combine like terms: 20 + -20 = 0 0 + -1z = 39 + -20 -1z = 39 + -20 Combine like terms: 39 + -20 = 19 -1z = 19 Divide each side by '-1'. z = -19 Simplifying z = -19
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