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Simplifying (15 + -1z) = 20z Remove parenthesis around (15 + -1z) 15 + -1z = 20z Solving 15 + -1z = 20z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-20z' to each side of the equation. 15 + -1z + -20z = 20z + -20z Combine like terms: -1z + -20z = -21z 15 + -21z = 20z + -20z Combine like terms: 20z + -20z = 0 15 + -21z = 0 Add '-15' to each side of the equation. 15 + -15 + -21z = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -21z = 0 + -15 -21z = 0 + -15 Combine like terms: 0 + -15 = -15 -21z = -15 Divide each side by '-21'. z = 0.7142857143 Simplifying z = 0.7142857143
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