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Simplifying -7x + -5(-4x + -9) = 123 Reorder the terms: -7x + -5(-9 + -4x) = 123 -7x + (-9 * -5 + -4x * -5) = 123 -7x + (45 + 20x) = 123 Reorder the terms: 45 + -7x + 20x = 123 Combine like terms: -7x + 20x = 13x 45 + 13x = 123 Solving 45 + 13x = 123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 13x = 123 + -45 Combine like terms: 45 + -45 = 0 0 + 13x = 123 + -45 13x = 123 + -45 Combine like terms: 123 + -45 = 78 13x = 78 Divide each side by '13'. x = 6 Simplifying x = 6
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