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Simplifying x * 2 + -21 = 15 + -3x * 2 Reorder the terms for easier multiplication: 2x + -21 = 15 + -3x * 2 Reorder the terms: -21 + 2x = 15 + -3x * 2 Reorder the terms for easier multiplication: -21 + 2x = 15 + -3 * 2x Multiply -3 * 2 -21 + 2x = 15 + -6x Solving -21 + 2x = 15 + -6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6x' to each side of the equation. -21 + 2x + 6x = 15 + -6x + 6x Combine like terms: 2x + 6x = 8x -21 + 8x = 15 + -6x + 6x Combine like terms: -6x + 6x = 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 = 36 8x = 36 Divide each side by '8'. x = 4.5 Simplifying x = 4.5
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