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Simplifying z + 19 + 4z + -7 + 90 = 180 Reorder the terms: 19 + -7 + 90 + z + 4z = 180 Combine like terms: 19 + -7 = 12 12 + 90 + z + 4z = 180 Combine like terms: 12 + 90 = 102 102 + z + 4z = 180 Combine like terms: z + 4z = 5z 102 + 5z = 180 Solving 102 + 5z = 180 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-102' to each side of the equation. 102 + -102 + 5z = 180 + -102 Combine like terms: 102 + -102 = 0 0 + 5z = 180 + -102 5z = 180 + -102 Combine like terms: 180 + -102 = 78 5z = 78 Divide each side by '5'. z = 15.6 Simplifying z = 15.6
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