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Simplifying z + 3(z + -7) = 9 Reorder the terms: z + 3(-7 + z) = 9 z + (-7 * 3 + z * 3) = 9 z + (-21 + 3z) = 9 Reorder the terms: -21 + z + 3z = 9 Combine like terms: z + 3z = 4z -21 + 4z = 9 Solving -21 + 4z = 9 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 4z = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 4z = 9 + 21 4z = 9 + 21 Combine like terms: 9 + 21 = 30 4z = 30 Divide each side by '4'. z = 7.5 Simplifying z = 7.5
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