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Simplifying 15x + -6 = 12x + 21 Reorder the terms: -6 + 15x = 12x + 21 Reorder the terms: -6 + 15x = 21 + 12x Solving -6 + 15x = 21 + 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. -6 + 15x + -12x = 21 + 12x + -12x Combine like terms: 15x + -12x = 3x -6 + 3x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 -6 + 3x = 21 + 0 -6 + 3x = 21 Add '6' to each side of the equation. -6 + 6 + 3x = 21 + 6 Combine like terms: -6 + 6 = 0 0 + 3x = 21 + 6 3x = 21 + 6 Combine like terms: 21 + 6 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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