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Simplifying 3(x + 2) + 3x + -2 = 21 Reorder the terms: 3(2 + x) + 3x + -2 = 21 (2 * 3 + x * 3) + 3x + -2 = 21 (6 + 3x) + 3x + -2 = 21 Reorder the terms: 6 + -2 + 3x + 3x = 21 Combine like terms: 6 + -2 = 4 4 + 3x + 3x = 21 Combine like terms: 3x + 3x = 6x 4 + 6x = 21 Solving 4 + 6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 6x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + 6x = 21 + -4 6x = 21 + -4 Combine like terms: 21 + -4 = 17 6x = 17 Divide each side by '6'. x = 2.833333333 Simplifying x = 2.833333333
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