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Simplifying z + 3(z + 7) = -5 Reorder the terms: z + 3(7 + z) = -5 z + (7 * 3 + z * 3) = -5 z + (21 + 3z) = -5 Reorder the terms: 21 + z + 3z = -5 Combine like terms: z + 3z = 4z 21 + 4z = -5 Solving 21 + 4z = -5 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 = -5 + -21 Combine like terms: 21 + -21 = 0 0 + 4z = -5 + -21 4z = -5 + -21 Combine like terms: -5 + -21 = -26 4z = -26 Divide each side by '4'. z = -6.5 Simplifying z = -6.5
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