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Simplifying -7x + -7(-3x + -13) = -21 Reorder the terms: -7x + -7(-13 + -3x) = -21 -7x + (-13 * -7 + -3x * -7) = -21 -7x + (91 + 21x) = -21 Reorder the terms: 91 + -7x + 21x = -21 Combine like terms: -7x + 21x = 14x 91 + 14x = -21 Solving 91 + 14x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-91' to each side of the equation. 91 + -91 + 14x = -21 + -91 Combine like terms: 91 + -91 = 0 0 + 14x = -21 + -91 14x = -21 + -91 Combine like terms: -21 + -91 = -112 14x = -112 Divide each side by '14'. x = -8 Simplifying x = -8
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