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Simplifying X + (X + 2) + (X + 4) + (X + 6) = 84 Reorder the terms: X + (2 + X) + (X + 4) + (X + 6) = 84 Remove parenthesis around (2 + X) X + 2 + X + (X + 4) + (X + 6) = 84 Reorder the terms: X + 2 + X + (4 + X) + (X + 6) = 84 Remove parenthesis around (4 + X) X + 2 + X + 4 + X + (X + 6) = 84 Reorder the terms: X + 2 + X + 4 + X + (6 + X) = 84 Remove parenthesis around (6 + X) X + 2 + X + 4 + X + 6 + X = 84 Reorder the terms: 2 + 4 + 6 + X + X + X + X = 84 Combine like terms: 2 + 4 = 6 6 + 6 + X + X + X + X = 84 Combine like terms: 6 + 6 = 12 12 + X + X + X + X = 84 Combine like terms: X + X = 2X 12 + 2X + X + X = 84 Combine like terms: 2X + X = 3X 12 + 3X + X = 84 Combine like terms: 3X + X = 4X 12 + 4X = 84 Solving 12 + 4X = 84 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 4X = 84 + -12 Combine like terms: 12 + -12 = 0 0 + 4X = 84 + -12 4X = 84 + -12 Combine like terms: 84 + -12 = 72 4X = 72 Divide each side by '4'. X = 18 Simplifying X = 18
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