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Simplifying 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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