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Simplifying 21 = 3(2x + 1) Reorder the terms: 21 = 3(1 + 2x) 21 = (1 * 3 + 2x * 3) 21 = (3 + 6x) Solving 21 = 3 + 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 = 3 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -6x = 3 + 0 21 + -6x = 3 Add '-21' to each side of the equation. 21 + -21 + -6x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = 3 + -21 -6x = 3 + -21 Combine like terms: 3 + -21 = -18 -6x = -18 Divide each side by '-6'. x = 3 Simplifying x = 3
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