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Simplifying X + (x + 3) = 18 Reorder the terms: X + (3 + x) = 18 Remove parenthesis around (3 + x) X + 3 + x = 18 Reorder the terms: 3 + X + x = 18 Solving 3 + X + x = 18 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + X + -3 + x = 18 + -3 Reorder the terms: 3 + -3 + X + x = 18 + -3 Combine like terms: 3 + -3 = 0 0 + X + x = 18 + -3 X + x = 18 + -3 Combine like terms: 18 + -3 = 15 X + x = 15 Add '-1x' to each side of the equation. X + x + -1x = 15 + -1x Combine like terms: x + -1x = 0 X + 0 = 15 + -1x X = 15 + -1x Simplifying X = 15 + -1x
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