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Simplifying 513 = -9(7x + 13) Reorder the terms: 513 = -9(13 + 7x) 513 = (13 * -9 + 7x * -9) 513 = (-117 + -63x) Solving 513 = -117 + -63x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63x' to each side of the equation. 513 + 63x = -117 + -63x + 63x Combine like terms: -63x + 63x = 0 513 + 63x = -117 + 0 513 + 63x = -117 Add '-513' to each side of the equation. 513 + -513 + 63x = -117 + -513 Combine like terms: 513 + -513 = 0 0 + 63x = -117 + -513 63x = -117 + -513 Combine like terms: -117 + -513 = -630 63x = -630 Divide each side by '63'. x = -10 Simplifying x = -10
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