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Simplifying x2 + 3x = x2 + 12 Reorder the terms: 3x + x2 = x2 + 12 Reorder the terms: 3x + x2 = 12 + x2 Add '-1x2' to each side of the equation. 3x + x2 + -1x2 = 12 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x + 0 = 12 + x2 + -1x2 3x = 12 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 3x = 12 + 0 3x = 12 Solving 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '3'. x = 4 Simplifying x = 4
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