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Simplifying -8x + 9x + -21 = -12 + -16 + 10 Reorder the terms: -21 + -8x + 9x = -12 + -16 + 10 Combine like terms: -8x + 9x = 1x -21 + 1x = -12 + -16 + 10 Combine like terms: -12 + -16 = -28 -21 + 1x = -28 + 10 Combine like terms: -28 + 10 = -18 -21 + 1x = -18 Solving -21 + 1x = -18 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 + 1x = -18 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = -18 + 21 1x = -18 + 21 Combine like terms: -18 + 21 = 3 1x = 3 Divide each side by '1'. x = 3 Simplifying x = 3
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