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Simplifying 21 = 12x + -15 Reorder the terms: 21 = -15 + 12x Solving 21 = -15 + 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 + -12x = -15 + 12x + -12x Combine like terms: 12x + -12x = 0 21 + -12x = -15 + 0 21 + -12x = -15 Add '-21' to each side of the equation. 21 + -21 + -12x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -12x = -15 + -21 -12x = -15 + -21 Combine like terms: -15 + -21 = -36 -12x = -36 Divide each side by '-12'. x = 3 Simplifying x = 3
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