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Simplifying 21 = 2x + (8 + -1x) * 3 Reorder the terms for easier multiplication: 21 = 2x + 3(8 + -1x) 21 = 2x + (8 * 3 + -1x * 3) 21 = 2x + (24 + -3x) Reorder the terms: 21 = 24 + 2x + -3x Combine like terms: 2x + -3x = -1x 21 = 24 + -1x Solving 21 = 24 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 21 + x = 24 + -1x + x Combine like terms: -1x + x = 0 21 + x = 24 + 0 21 + x = 24 Add '-21' to each side of the equation. 21 + -21 + x = 24 + -21 Combine like terms: 21 + -21 = 0 0 + x = 24 + -21 x = 24 + -21 Combine like terms: 24 + -21 = 3 x = 3 Simplifying x = 3
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