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Simplifying 15x + -21 = 39 + 3x Reorder the terms: -21 + 15x = 39 + 3x Solving -21 + 15x = 39 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -21 + 15x + -3x = 39 + 3x + -3x Combine like terms: 15x + -3x = 12x -21 + 12x = 39 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 12x = 39 + 0 -21 + 12x = 39 Add '21' to each side of the equation. -21 + 21 + 12x = 39 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = 39 + 21 12x = 39 + 21 Combine like terms: 39 + 21 = 60 12x = 60 Divide each side by '12'. x = 5 Simplifying x = 5
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