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Simplifying 12x + -13 = 21x + -4 Reorder the terms: -13 + 12x = 21x + -4 Reorder the terms: -13 + 12x = -4 + 21x Solving -13 + 12x = -4 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -13 + 12x + -21x = -4 + 21x + -21x Combine like terms: 12x + -21x = -9x -13 + -9x = -4 + 21x + -21x Combine like terms: 21x + -21x = 0 -13 + -9x = -4 + 0 -13 + -9x = -4 Add '13' to each side of the equation. -13 + 13 + -9x = -4 + 13 Combine like terms: -13 + 13 = 0 0 + -9x = -4 + 13 -9x = -4 + 13 Combine like terms: -4 + 13 = 9 -9x = 9 Divide each side by '-9'. x = -1 Simplifying x = -1
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