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Simplifying 3x * 2 + -21 = 21 Reorder the terms for easier multiplication: 3 * 2x + -21 = 21 Multiply 3 * 2 6x + -21 = 21 Reorder the terms: -21 + 6x = 21 Solving -21 + 6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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