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Simplifying 18 + 7(18 + 3x) + 7 = 0 18 + (18 * 7 + 3x * 7) + 7 = 0 18 + (126 + 21x) + 7 = 0 Reorder the terms: 18 + 126 + 7 + 21x = 0 Combine like terms: 18 + 126 = 144 144 + 7 + 21x = 0 Combine like terms: 144 + 7 = 151 151 + 21x = 0 Solving 151 + 21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-151' to each side of the equation. 151 + -151 + 21x = 0 + -151 Combine like terms: 151 + -151 = 0 0 + 21x = 0 + -151 21x = 0 + -151 Combine like terms: 0 + -151 = -151 21x = -151 Divide each side by '21'. x = -7.19047619 Simplifying x = -7.19047619
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