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Simplifying 9(2x + -2) = 21 Reorder the terms: 9(-2 + 2x) = 21 (-2 * 9 + 2x * 9) = 21 (-18 + 18x) = 21 Solving -18 + 18x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 18x = 21 + 18 Combine like terms: -18 + 18 = 0 0 + 18x = 21 + 18 18x = 21 + 18 Combine like terms: 21 + 18 = 39 18x = 39 Divide each side by '18'. x = 2.166666667 Simplifying x = 2.166666667
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