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Simplifying X + (X + 3) + 4x = 21 Reorder the terms: X + (3 + X) + 4x = 21 Remove parenthesis around (3 + X) X + 3 + X + 4x = 21 Reorder the terms: 3 + X + X + 4x = 21 Combine like terms: X + X = 2X 3 + 2X + 4x = 21 Solving 3 + 2X + 4x = 21 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 + 2X + -3 + 4x = 21 + -3 Reorder the terms: 3 + -3 + 2X + 4x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2X + 4x = 21 + -3 2X + 4x = 21 + -3 Combine like terms: 21 + -3 = 18 2X + 4x = 18 Add '-4x' to each side of the equation. 2X + 4x + -4x = 18 + -4x Combine like terms: 4x + -4x = 0 2X + 0 = 18 + -4x 2X = 18 + -4x Divide each side by '2'. X = 9 + -2x Simplifying X = 9 + -2x
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