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Simplifying -12 = x + 3x Combine like terms: x + 3x = 4x -12 = 4x Solving -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. -12 + -4x = 4x + -4x Combine like terms: 4x + -4x = 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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