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Simplifying 21 + -4(9 + 4z) = 0 21 + (9 * -4 + 4z * -4) = 0 21 + (-36 + -16z) = 0 Combine like terms: 21 + -36 = -15 -15 + -16z = 0 Solving -15 + -16z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -16z = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -16z = 0 + 15 -16z = 0 + 15 Combine like terms: 0 + 15 = 15 -16z = 15 Divide each side by '-16'. z = -0.9375 Simplifying z = -0.9375
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