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Simplifying 3x + z = x + 21 Reorder the terms: 3x + z = 21 + x Solving 3x + z = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 3x + -1x + z = 21 + x + -1x Combine like terms: 3x + -1x = 2x 2x + z = 21 + x + -1x Combine like terms: x + -1x = 0 2x + z = 21 + 0 2x + z = 21 Add '-1z' to each side of the equation. 2x + z + -1z = 21 + -1z Combine like terms: z + -1z = 0 2x + 0 = 21 + -1z 2x = 21 + -1z Divide each side by '2'. x = 10.5 + -0.5z Simplifying x = 10.5 + -0.5z
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