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Simplifying 12x + 21 = 15x + -3 Reorder the terms: 21 + 12x = 15x + -3 Reorder the terms: 21 + 12x = -3 + 15x Solving 21 + 12x = -3 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 21 + 12x + -15x = -3 + 15x + -15x Combine like terms: 12x + -15x = -3x 21 + -3x = -3 + 15x + -15x Combine like terms: 15x + -15x = 0 21 + -3x = -3 + 0 21 + -3x = -3 Add '-21' to each side of the equation. 21 + -21 + -3x = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = -3 + -21 -3x = -3 + -21 Combine like terms: -3 + -21 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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