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Simplifying 3 + x = 12 + 4x Solving 3 + 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. 3 + x + -4x = 12 + 4x + -4x Combine like terms: x + -4x = -3x 3 + -3x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 3 + -3x = 12 + 0 3 + -3x = 12 Add '-3' to each side of the equation. 3 + -3 + -3x = 12 + -3 Combine like terms: 3 + -3 = 0 0 + -3x = 12 + -3 -3x = 12 + -3 Combine like terms: 12 + -3 = 9 -3x = 9 Divide each side by '-3'. x = -3 Simplifying x = -3
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