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Simplifying 7x + 7(2x + 18) = -21 Reorder the terms: 7x + 7(18 + 2x) = -21 7x + (18 * 7 + 2x * 7) = -21 7x + (126 + 14x) = -21 Reorder the terms: 126 + 7x + 14x = -21 Combine like terms: 7x + 14x = 21x 126 + 21x = -21 Solving 126 + 21x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-126' to each side of the equation. 126 + -126 + 21x = -21 + -126 Combine like terms: 126 + -126 = 0 0 + 21x = -21 + -126 21x = -21 + -126 Combine like terms: -21 + -126 = -147 21x = -147 Divide each side by '21'. x = -7 Simplifying x = -7
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