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Simplifying -39 = -6x + 3(x + 4) Reorder the terms: -39 = -6x + 3(4 + x) -39 = -6x + (4 * 3 + x * 3) -39 = -6x + (12 + 3x) Reorder the terms: -39 = 12 + -6x + 3x Combine like terms: -6x + 3x = -3x -39 = 12 + -3x Solving -39 = 12 + -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. -39 + 3x = 12 + -3x + 3x Combine like terms: -3x + 3x = 0 -39 + 3x = 12 + 0 -39 + 3x = 12 Add '39' to each side of the equation. -39 + 39 + 3x = 12 + 39 Combine like terms: -39 + 39 = 0 0 + 3x = 12 + 39 3x = 12 + 39 Combine like terms: 12 + 39 = 51 3x = 51 Divide each side by '3'. x = 17 Simplifying x = 17
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