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Simplifying 7x + -7(-2x + -18) = -84 Reorder the terms: 7x + -7(-18 + -2x) = -84 7x + (-18 * -7 + -2x * -7) = -84 7x + (126 + 14x) = -84 Reorder the terms: 126 + 7x + 14x = -84 Combine like terms: 7x + 14x = 21x 126 + 21x = -84 Solving 126 + 21x = -84 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 = -84 + -126 Combine like terms: 126 + -126 = 0 0 + 21x = -84 + -126 21x = -84 + -126 Combine like terms: -84 + -126 = -210 21x = -210 Divide each side by '21'. x = -10 Simplifying x = -10
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