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Simplifying 12x + 21 = 15x + 15 Reorder the terms: 21 + 12x = 15x + 15 Reorder the terms: 21 + 12x = 15 + 15x Solving 21 + 12x = 15 + 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 = 15 + 15x + -15x Combine like terms: 12x + -15x = -3x 21 + -3x = 15 + 15x + -15x Combine like terms: 15x + -15x = 0 21 + -3x = 15 + 0 21 + -3x = 15 Add '-21' to each side of the equation. 21 + -21 + -3x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 15 + -21 -3x = 15 + -21 Combine like terms: 15 + -21 = -6 -3x = -6 Divide each side by '-3'. x = 2 Simplifying x = 2
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