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Simplifying 4x + -21 = -12x + 21 Reorder the terms: -21 + 4x = -12x + 21 Reorder the terms: -21 + 4x = 21 + -12x Solving -21 + 4x = 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. -21 + 4x + 12x = 21 + -12x + 12x Combine like terms: 4x + 12x = 16x -21 + 16x = 21 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 + 16x = 21 + 0 -21 + 16x = 21 Add '21' to each side of the equation. -21 + 21 + 16x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 16x = 21 + 21 16x = 21 + 21 Combine like terms: 21 + 21 = 42 16x = 42 Divide each side by '16'. x = 2.625 Simplifying x = 2.625
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