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Simplifying 12X + -3X + 87 = 12X + 45 Reorder the terms: 87 + 12X + -3X = 12X + 45 Combine like terms: 12X + -3X = 9X 87 + 9X = 12X + 45 Reorder the terms: 87 + 9X = 45 + 12X Solving 87 + 9X = 45 + 12X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-12X' to each side of the equation. 87 + 9X + -12X = 45 + 12X + -12X Combine like terms: 9X + -12X = -3X 87 + -3X = 45 + 12X + -12X Combine like terms: 12X + -12X = 0 87 + -3X = 45 + 0 87 + -3X = 45 Add '-87' to each side of the equation. 87 + -87 + -3X = 45 + -87 Combine like terms: 87 + -87 = 0 0 + -3X = 45 + -87 -3X = 45 + -87 Combine like terms: 45 + -87 = -42 -3X = -42 Divide each side by '-3'. X = 14 Simplifying X = 14
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