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Simplifying 3(5) + -2(4) + 9z = -20 Multiply 3 * 5 15 + -2(4) + 9z = -20 Multiply -2 * 4 15 + -8 + 9z = -20 Combine like terms: 15 + -8 = 7 7 + 9z = -20 Solving 7 + 9z = -20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 9z = -20 + -7 Combine like terms: 7 + -7 = 0 0 + 9z = -20 + -7 9z = -20 + -7 Combine like terms: -20 + -7 = -27 9z = -27 Divide each side by '9'. z = -3 Simplifying z = -3
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