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Simplifying 9 + -1(5z + 2) = 7 Reorder the terms: 9 + -1(2 + 5z) = 7 9 + (2 * -1 + 5z * -1) = 7 9 + (-2 + -5z) = 7 Combine like terms: 9 + -2 = 7 7 + -5z = 7 Add '-7' to each side of the equation. 7 + -7 + -5z = 7 + -7 Combine like terms: 7 + -7 = 0 0 + -5z = 7 + -7 -5z = 7 + -7 Combine like terms: 7 + -7 = 0 -5z = 0 Solving -5z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Divide each side by '-5'. z = 0 Simplifying z = 0
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