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Simplifying (X) + (x + 9) + (x + 9 + -3) = 207 X + (x + 9) + (x + 9 + -3) = 207 Reorder the terms: X + (9 + x) + (x + 9 + -3) = 207 Remove parenthesis around (9 + x) X + 9 + x + (x + 9 + -3) = 207 Reorder the terms: X + 9 + x + (9 + -3 + x) = 207 Combine like terms: 9 + -3 = 6 X + 9 + x + (6 + x) = 207 Remove parenthesis around (6 + x) X + 9 + x + 6 + x = 207 Reorder the terms: 9 + 6 + X + x + x = 207 Combine like terms: 9 + 6 = 15 15 + X + x + x = 207 Combine like terms: x + x = 2x 15 + X + 2x = 207 Solving 15 + X + 2x = 207 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + X + -15 + 2x = 207 + -15 Reorder the terms: 15 + -15 + X + 2x = 207 + -15 Combine like terms: 15 + -15 = 0 0 + X + 2x = 207 + -15 X + 2x = 207 + -15 Combine like terms: 207 + -15 = 192 X + 2x = 192 Add '-2x' to each side of the equation. X + 2x + -2x = 192 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 192 + -2x X = 192 + -2x Simplifying X = 192 + -2x
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