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Simplifying 4x + 9 + 7z = 31 Reorder the terms: 9 + 4x + 7z = 31 Solving 9 + 4x + 7z = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 4x + -9 + 7z = 31 + -9 Reorder the terms: 9 + -9 + 4x + 7z = 31 + -9 Combine like terms: 9 + -9 = 0 0 + 4x + 7z = 31 + -9 4x + 7z = 31 + -9 Combine like terms: 31 + -9 = 22 4x + 7z = 22 Add '-7z' to each side of the equation. 4x + 7z + -7z = 22 + -7z Combine like terms: 7z + -7z = 0 4x + 0 = 22 + -7z 4x = 22 + -7z Divide each side by '4'. x = 5.5 + -1.75z Simplifying x = 5.5 + -1.75z
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