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Simplifying 3x + -15 = -3x + 21 Reorder the terms: -15 + 3x = -3x + 21 Reorder the terms: -15 + 3x = 21 + -3x Solving -15 + 3x = 21 + -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. -15 + 3x + 3x = 21 + -3x + 3x Combine like terms: 3x + 3x = 6x -15 + 6x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 -15 + 6x = 21 + 0 -15 + 6x = 21 Add '15' to each side of the equation. -15 + 15 + 6x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 6x = 21 + 15 6x = 21 + 15 Combine like terms: 21 + 15 = 36 6x = 36 Divide each side by '6'. x = 6 Simplifying x = 6
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