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Simplifying 3x + -21 = -9x + 7 Reorder the terms: -21 + 3x = -9x + 7 Reorder the terms: -21 + 3x = 7 + -9x Solving -21 + 3x = 7 + -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 + 3x + 9x = 7 + -9x + 9x Combine like terms: 3x + 9x = 12x -21 + 12x = 7 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 12x = 7 + 0 -21 + 12x = 7 Add '21' to each side of the equation. -21 + 21 + 12x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = 7 + 21 12x = 7 + 21 Combine like terms: 7 + 21 = 28 12x = 28 Divide each side by '12'. x = 2.333333333 Simplifying x = 2.333333333
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