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Simplifying (12 + x) + -4x = x Remove parenthesis around (12 + x) 12 + x + -4x = x Combine like terms: x + -4x = -3x 12 + -3x = x Solving 12 + -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. 12 + -3x + -1x = x + -1x Combine like terms: -3x + -1x = -4x 12 + -4x = x + -1x Combine like terms: x + -1x = 0 12 + -4x = 0 Add '-12' to each side of the equation. 12 + -12 + -4x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -4x = 0 + -12 -4x = 0 + -12 Combine like terms: 0 + -12 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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