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Simplifying x + 39 = 4x + 12 Reorder the terms: 39 + x = 4x + 12 Reorder the terms: 39 + x = 12 + 4x Solving 39 + x = 12 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 39 + x + -4x = 12 + 4x + -4x Combine like terms: x + -4x = -3x 39 + -3x = 12 + 4x + -4x Combine like terms: 4x + -4x = 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 = -27 -3x = -27 Divide each side by '-3'. x = 9 Simplifying x = 9
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