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Simplifying 12 + -1(-8x) + 2x + -1(-9) = 0 Remove parenthesis around (-8x) 12 + -1 * -8x + 2x + -1(-9) = 0 Multiply -1 * -8 12 + 8x + 2x + -1(-9) = 0 Multiply -1 * -9 12 + 8x + 2x + 9 = 0 Reorder the terms: 12 + 9 + 8x + 2x = 0 Combine like terms: 12 + 9 = 21 21 + 8x + 2x = 0 Combine like terms: 8x + 2x = 10x 21 + 10x = 0 Solving 21 + 10x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 10x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 10x = 0 + -21 10x = 0 + -21 Combine like terms: 0 + -21 = -21 10x = -21 Divide each side by '10'. x = -2.1 Simplifying x = -2.1
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