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Simplifying x + 21 + x = x + 36 Reorder the terms: 21 + x + x = x + 36 Combine like terms: x + x = 2x 21 + 2x = x + 36 Reorder the terms: 21 + 2x = 36 + x Solving 21 + 2x = 36 + 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. 21 + 2x + -1x = 36 + x + -1x Combine like terms: 2x + -1x = 1x 21 + 1x = 36 + x + -1x Combine like terms: x + -1x = 0 21 + 1x = 36 + 0 21 + 1x = 36 Add '-21' to each side of the equation. 21 + -21 + 1x = 36 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 36 + -21 1x = 36 + -21 Combine like terms: 36 + -21 = 15 1x = 15 Divide each side by '1'. x = 15 Simplifying x = 15
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