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Simplifying 12 + 3x = 12 + x Add '-12' to each side of the equation. 12 + -12 + 3x = 12 + -12 + x Combine like terms: 12 + -12 = 0 0 + 3x = 12 + -12 + x 3x = 12 + -12 + x Combine like terms: 12 + -12 = 0 3x = 0 + x 3x = x Solving 3x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 3x + -1x = x + -1x Combine like terms: 3x + -1x = 2x 2x = x + -1x Combine like terms: x + -1x = 0 2x = 0 Divide each side by '2'. x = 0 Simplifying x = 0
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