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Simplifying 12x + 13 = 9x + -21 Reorder the terms: 13 + 12x = 9x + -21 Reorder the terms: 13 + 12x = -21 + 9x Solving 13 + 12x = -21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 13 + 12x + -9x = -21 + 9x + -9x Combine like terms: 12x + -9x = 3x 13 + 3x = -21 + 9x + -9x Combine like terms: 9x + -9x = 0 13 + 3x = -21 + 0 13 + 3x = -21 Add '-13' to each side of the equation. 13 + -13 + 3x = -21 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = -21 + -13 3x = -21 + -13 Combine like terms: -21 + -13 = -34 3x = -34 Divide each side by '3'. x = -11.33333333 Simplifying x = -11.33333333
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