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Simplifying X + 15 + x + 15 = x + 21 Reorder the terms: 15 + 15 + X + x = x + 21 Combine like terms: 15 + 15 = 30 30 + X + x = x + 21 Reorder the terms: 30 + X + x = 21 + x Add '-1x' to each side of the equation. 30 + X + x + -1x = 21 + x + -1x Combine like terms: x + -1x = 0 30 + X + 0 = 21 + x + -1x 30 + X = 21 + x + -1x Combine like terms: x + -1x = 0 30 + X = 21 + 0 30 + X = 21 Solving 30 + X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + X = 21 + -30 Combine like terms: 30 + -30 = 0 0 + X = 21 + -30 X = 21 + -30 Combine like terms: 21 + -30 = -9 X = -9 Simplifying X = -9
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