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Simplifying 4x + -21 = -2x + 21 Reorder the terms: -21 + 4x = -2x + 21 Reorder the terms: -21 + 4x = 21 + -2x Solving -21 + 4x = 21 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -21 + 4x + 2x = 21 + -2x + 2x Combine like terms: 4x + 2x = 6x -21 + 6x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 -21 + 6x = 21 + 0 -21 + 6x = 21 Add '21' to each side of the equation. -21 + 21 + 6x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 6x = 21 + 21 6x = 21 + 21 Combine like terms: 21 + 21 = 42 6x = 42 Divide each side by '6'. x = 7 Simplifying x = 7
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