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Simplifying 15 + -1(-7x) + 5x + -1(-9) = 0 Remove parenthesis around (-7x) 15 + -1 * -7x + 5x + -1(-9) = 0 Multiply -1 * -7 15 + 7x + 5x + -1(-9) = 0 Multiply -1 * -9 15 + 7x + 5x + 9 = 0 Reorder the terms: 15 + 9 + 7x + 5x = 0 Combine like terms: 15 + 9 = 24 24 + 7x + 5x = 0 Combine like terms: 7x + 5x = 12x 24 + 12x = 0 Solving 24 + 12x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 12x = 0 + -24 Combine like terms: 24 + -24 = 0 0 + 12x = 0 + -24 12x = 0 + -24 Combine like terms: 0 + -24 = -24 12x = -24 Divide each side by '12'. x = -2 Simplifying x = -2
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