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Simplifying 7z + -4 = 13 + z Reorder the terms: -4 + 7z = 13 + z Solving -4 + 7z = 13 + 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. -4 + 7z + -1z = 13 + z + -1z Combine like terms: 7z + -1z = 6z -4 + 6z = 13 + z + -1z Combine like terms: z + -1z = 0 -4 + 6z = 13 + 0 -4 + 6z = 13 Add '4' to each side of the equation. -4 + 4 + 6z = 13 + 4 Combine like terms: -4 + 4 = 0 0 + 6z = 13 + 4 6z = 13 + 4 Combine like terms: 13 + 4 = 17 6z = 17 Divide each side by '6'. z = 2.833333333 Simplifying z = 2.833333333
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