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Simplifying 6x + -21 = 31 + 9x Reorder the terms: -21 + 6x = 31 + 9x Solving -21 + 6x = 31 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -21 + 6x + -9x = 31 + 9x + -9x Combine like terms: 6x + -9x = -3x -21 + -3x = 31 + 9x + -9x Combine like terms: 9x + -9x = 0 -21 + -3x = 31 + 0 -21 + -3x = 31 Add '21' to each side of the equation. -21 + 21 + -3x = 31 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 31 + 21 -3x = 31 + 21 Combine like terms: 31 + 21 = 52 -3x = 52 Divide each side by '-3'. x = -17.33333333 Simplifying x = -17.33333333
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