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Simplifying (10X + -9) * 2 = 8X + 12 Reorder the terms: (-9 + 10X) * 2 = 8X + 12 Reorder the terms for easier multiplication: 2(-9 + 10X) = 8X + 12 (-9 * 2 + 10X * 2) = 8X + 12 (-18 + 20X) = 8X + 12 Reorder the terms: -18 + 20X = 12 + 8X Solving -18 + 20X = 12 + 8X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-8X' to each side of the equation. -18 + 20X + -8X = 12 + 8X + -8X Combine like terms: 20X + -8X = 12X -18 + 12X = 12 + 8X + -8X Combine like terms: 8X + -8X = 0 -18 + 12X = 12 + 0 -18 + 12X = 12 Add '18' to each side of the equation. -18 + 18 + 12X = 12 + 18 Combine like terms: -18 + 18 = 0 0 + 12X = 12 + 18 12X = 12 + 18 Combine like terms: 12 + 18 = 30 12X = 30 Divide each side by '12'. X = 2.5 Simplifying X = 2.5
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