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Simplifying -7 + -7(-3x + -13) = -21 Reorder the terms: -7 + -7(-13 + -3x) = -21 -7 + (-13 * -7 + -3x * -7) = -21 -7 + (91 + 21x) = -21 Combine like terms: -7 + 91 = 84 84 + 21x = -21 Solving 84 + 21x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 21x = -21 + -84 Combine like terms: 84 + -84 = 0 0 + 21x = -21 + -84 21x = -21 + -84 Combine like terms: -21 + -84 = -105 21x = -105 Divide each side by '21'. x = -5 Simplifying x = -5
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