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Simplifying 12x + -9 = 13x Reorder the terms: -9 + 12x = 13x Solving -9 + 12x = 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. -9 + 12x + -13x = 13x + -13x Combine like terms: 12x + -13x = -1x -9 + -1x = 13x + -13x Combine like terms: 13x + -13x = 0 -9 + -1x = 0 Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9
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