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Simplifying 21 + -13x = 24 + -12x Solving 21 + -13x = 24 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 21 + -13x + 12x = 24 + -12x + 12x Combine like terms: -13x + 12x = -1x 21 + -1x = 24 + -12x + 12x Combine like terms: -12x + 12x = 0 21 + -1x = 24 + 0 21 + -1x = 24 Add '-21' to each side of the equation. 21 + -21 + -1x = 24 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 24 + -21 -1x = 24 + -21 Combine like terms: 24 + -21 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3
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