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Simplifying 21 = 3(x + 3) + 3x Reorder the terms: 21 = 3(3 + x) + 3x 21 = (3 * 3 + x * 3) + 3x 21 = (9 + 3x) + 3x Combine like terms: 3x + 3x = 6x 21 = 9 + 6x Solving 21 = 9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + -6x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -6x = 9 + 0 21 + -6x = 9 Add '-21' to each side of the equation. 21 + -21 + -6x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = 9 + -21 -6x = 9 + -21 Combine like terms: 9 + -21 = -12 -6x = -12 Divide each side by '-6'. x = 2 Simplifying x = 2
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