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Simplifying -6x + -21 + 9x = 42 Reorder the terms: -21 + -6x + 9x = 42 Combine like terms: -6x + 9x = 3x -21 + 3x = 42 Solving -21 + 3x = 42 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 + 3x = 42 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 42 + 21 3x = 42 + 21 Combine like terms: 42 + 21 = 63 3x = 63 Divide each side by '3'. x = 21 Simplifying x = 21
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