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Simplifying (12 + x) + 4 = 3x Remove parenthesis around (12 + x) 12 + x + 4 = 3x Reorder the terms: 12 + 4 + x = 3x Combine like terms: 12 + 4 = 16 16 + x = 3x Solving 16 + x = 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. 16 + x + -3x = 3x + -3x Combine like terms: x + -3x = -2x 16 + -2x = 3x + -3x Combine like terms: 3x + -3x = 0 16 + -2x = 0 Add '-16' to each side of the equation. 16 + -16 + -2x = 0 + -16 Combine like terms: 16 + -16 = 0 0 + -2x = 0 + -16 -2x = 0 + -16 Combine like terms: 0 + -16 = -16 -2x = -16 Divide each side by '-2'. x = 8 Simplifying x = 8
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