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Simplifying 9x + -21 = 6x + 42 Reorder the terms: -21 + 9x = 6x + 42 Reorder the terms: -21 + 9x = 42 + 6x Solving -21 + 9x = 42 + 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 + 9x + -6x = 42 + 6x + -6x Combine like terms: 9x + -6x = 3x -21 + 3x = 42 + 6x + -6x Combine like terms: 6x + -6x = 0 -21 + 3x = 42 + 0 -21 + 3x = 42 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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