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Simplifying x + -3 = 12 + 4x Reorder the terms: -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 = 15 -3x = 15 Divide each side by '-3'. x = -5 Simplifying x = -5
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