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Simplifying 3(1 + -1x) + 5x = -21 (1 * 3 + -1x * 3) + 5x = -21 (3 + -3x) + 5x = -21 Combine like terms: -3x + 5x = 2x 3 + 2x = -21 Solving 3 + 2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = -21 + -3 2x = -21 + -3 Combine like terms: -21 + -3 = -24 2x = -24 Divide each side by '2'. x = -12 Simplifying x = -12
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