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Simplifying 3(-12 + 3X) = -78 + 3X (-12 * 3 + 3X * 3) = -78 + 3X (-36 + 9X) = -78 + 3X Solving -36 + 9X = -78 + 3X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3X' to each side of the equation. -36 + 9X + -3X = -78 + 3X + -3X Combine like terms: 9X + -3X = 6X -36 + 6X = -78 + 3X + -3X Combine like terms: 3X + -3X = 0 -36 + 6X = -78 + 0 -36 + 6X = -78 Add '36' to each side of the equation. -36 + 36 + 6X = -78 + 36 Combine like terms: -36 + 36 = 0 0 + 6X = -78 + 36 6X = -78 + 36 Combine like terms: -78 + 36 = -42 6X = -42 Divide each side by '6'. X = -7 Simplifying X = -7
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