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Simplifying 4z + -9 = 30 + z Reorder the terms: -9 + 4z = 30 + z Solving -9 + 4z = 30 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -9 + 4z + -1z = 30 + z + -1z Combine like terms: 4z + -1z = 3z -9 + 3z = 30 + z + -1z Combine like terms: z + -1z = 0 -9 + 3z = 30 + 0 -9 + 3z = 30 Add '9' to each side of the equation. -9 + 9 + 3z = 30 + 9 Combine like terms: -9 + 9 = 0 0 + 3z = 30 + 9 3z = 30 + 9 Combine like terms: 30 + 9 = 39 3z = 39 Divide each side by '3'. z = 13 Simplifying z = 13
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