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Simplifying 15x + -21 = 4x + 12 Reorder the terms: -21 + 15x = 4x + 12 Reorder the terms: -21 + 15x = 12 + 4x Solving -21 + 15x = 12 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -21 + 15x + -4x = 12 + 4x + -4x Combine like terms: 15x + -4x = 11x -21 + 11x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 11x = 12 + 0 -21 + 11x = 12 Add '21' to each side of the equation. -21 + 21 + 11x = 12 + 21 Combine like terms: -21 + 21 = 0 0 + 11x = 12 + 21 11x = 12 + 21 Combine like terms: 12 + 21 = 33 11x = 33 Divide each side by '11'. x = 3 Simplifying x = 3
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