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Simplifying 21 + 12x = 15 + 4x Solving 21 + 12x = 15 + 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 + 12x + -4x = 15 + 4x + -4x Combine like terms: 12x + -4x = 8x 21 + 8x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + 8x = 15 + 0 21 + 8x = 15 Add '-21' to each side of the equation. 21 + -21 + 8x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = 15 + -21 8x = 15 + -21 Combine like terms: 15 + -21 = -6 8x = -6 Divide each side by '8'. x = -0.75 Simplifying x = -0.75
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