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Simplifying X + (x + 2) + (x + 4) = 21 Reorder the terms: X + (2 + x) + (x + 4) = 21 Remove parenthesis around (2 + x) X + 2 + x + (x + 4) = 21 Reorder the terms: X + 2 + x + (4 + x) = 21 Remove parenthesis around (4 + x) X + 2 + x + 4 + x = 21 Reorder the terms: 2 + 4 + X + x + x = 21 Combine like terms: 2 + 4 = 6 6 + X + x + x = 21 Combine like terms: x + x = 2x 6 + X + 2x = 21 Solving 6 + X + 2x = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + X + -6 + 2x = 21 + -6 Reorder the terms: 6 + -6 + X + 2x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + X + 2x = 21 + -6 X + 2x = 21 + -6 Combine like terms: 21 + -6 = 15 X + 2x = 15 Add '-2x' to each side of the equation. X + 2x + -2x = 15 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 15 + -2x X = 15 + -2x Simplifying X = 15 + -2x
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