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Simplifying 21 = 2x + 3(x + 4) Reorder the terms: 21 = 2x + 3(4 + x) 21 = 2x + (4 * 3 + x * 3) 21 = 2x + (12 + 3x) Reorder the terms: 21 = 12 + 2x + 3x Combine like terms: 2x + 3x = 5x 21 = 12 + 5x Solving 21 = 12 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + -5x = 12 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -5x = 12 + 0 21 + -5x = 12 Add '-21' to each side of the equation. 21 + -21 + -5x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = 12 + -21 -5x = 12 + -21 Combine like terms: 12 + -21 = -9 -5x = -9 Divide each side by '-5'. x = 1.8 Simplifying x = 1.8
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