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Simplifying 21 + (3x + 5) = x Reorder the terms: 21 + (5 + 3x) = x Remove parenthesis around (5 + 3x) 21 + 5 + 3x = x Combine like terms: 21 + 5 = 26 26 + 3x = x Solving 26 + 3x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 26 + 3x + -1x = x + -1x Combine like terms: 3x + -1x = 2x 26 + 2x = x + -1x Combine like terms: x + -1x = 0 26 + 2x = 0 Add '-26' to each side of the equation. 26 + -26 + 2x = 0 + -26 Combine like terms: 26 + -26 = 0 0 + 2x = 0 + -26 2x = 0 + -26 Combine like terms: 0 + -26 = -26 2x = -26 Divide each side by '2'. x = -13 Simplifying x = -13
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