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Simplifying x + 21 = 5 + 2x + (x + 3) Reorder the terms: 21 + x = 5 + 2x + (x + 3) Reorder the terms: 21 + x = 5 + 2x + (3 + x) Remove parenthesis around (3 + x) 21 + x = 5 + 2x + 3 + x Reorder the terms: 21 + x = 5 + 3 + 2x + x Combine like terms: 5 + 3 = 8 21 + x = 8 + 2x + x Combine like terms: 2x + x = 3x 21 + x = 8 + 3x Solving 21 + x = 8 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + x + -3x = 8 + 3x + -3x Combine like terms: x + -3x = -2x 21 + -2x = 8 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -2x = 8 + 0 21 + -2x = 8 Add '-21' to each side of the equation. 21 + -21 + -2x = 8 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 8 + -21 -2x = 8 + -21 Combine like terms: 8 + -21 = -13 -2x = -13 Divide each side by '-2'. x = 6.5 Simplifying x = 6.5
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