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Simplifying -7x + -3(-7x + -14) = 168 Reorder the terms: -7x + -3(-14 + -7x) = 168 -7x + (-14 * -3 + -7x * -3) = 168 -7x + (42 + 21x) = 168 Reorder the terms: 42 + -7x + 21x = 168 Combine like terms: -7x + 21x = 14x 42 + 14x = 168 Solving 42 + 14x = 168 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 14x = 168 + -42 Combine like terms: 42 + -42 = 0 0 + 14x = 168 + -42 14x = 168 + -42 Combine like terms: 168 + -42 = 126 14x = 126 Divide each side by '14'. x = 9 Simplifying x = 9
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