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Simplifying 2x + 7(3x + 7) = -20 Reorder the terms: 2x + 7(7 + 3x) = -20 2x + (7 * 7 + 3x * 7) = -20 2x + (49 + 21x) = -20 Reorder the terms: 49 + 2x + 21x = -20 Combine like terms: 2x + 21x = 23x 49 + 23x = -20 Solving 49 + 23x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 23x = -20 + -49 Combine like terms: 49 + -49 = 0 0 + 23x = -20 + -49 23x = -20 + -49 Combine like terms: -20 + -49 = -69 23x = -69 Divide each side by '23'. x = -3 Simplifying x = -3
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