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Simplifying 20 + -1(-15z) = 16z Remove parenthesis around (-15z) 20 + -1 * -15z = 16z Multiply -1 * -15 20 + 15z = 16z Solving 20 + 15z = 16z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-16z' to each side of the equation. 20 + 15z + -16z = 16z + -16z Combine like terms: 15z + -16z = -1z 20 + -1z = 16z + -16z Combine like terms: 16z + -16z = 0 20 + -1z = 0 Add '-20' to each side of the equation. 20 + -20 + -1z = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -1z = 0 + -20 -1z = 0 + -20 Combine like terms: 0 + -20 = -20 -1z = -20 Divide each side by '-1'. z = 20 Simplifying z = 20
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