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Simplifying 3 + 9 = x + -9 Combine like terms: 3 + 9 = 12 12 = x + -9 Reorder the terms: 12 = -9 + x Solving 12 = -9 + 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 + -1x = -9 + x + -1x Combine like terms: x + -1x = 0 12 + -1x = -9 + 0 12 + -1x = -9 Add '-12' to each side of the equation. 12 + -12 + -1x = -9 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = -9 + -12 -1x = -9 + -12 Combine like terms: -9 + -12 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21
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