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Simplifying -21 = 6x + -7x + -9 Reorder the terms: -21 = -9 + 6x + -7x Combine like terms: 6x + -7x = -1x -21 = -9 + -1x Solving -21 = -9 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -21 + x = -9 + -1x + x Combine like terms: -1x + x = 0 -21 + x = -9 + 0 -21 + x = -9 Add '21' to each side of the equation. -21 + 21 + x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + x = -9 + 21 x = -9 + 21 Combine like terms: -9 + 21 = 12 x = 12 Simplifying x = 12
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