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Simplifying 9x(x + -2) = 9x2 + 40 Reorder the terms: 9x(-2 + x) = 9x2 + 40 (-2 * 9x + x * 9x) = 9x2 + 40 (-18x + 9x2) = 9x2 + 40 Reorder the terms: -18x + 9x2 = 40 + 9x2 Add '-9x2' to each side of the equation. -18x + 9x2 + -9x2 = 40 + 9x2 + -9x2 Combine like terms: 9x2 + -9x2 = 0 -18x + 0 = 40 + 9x2 + -9x2 -18x = 40 + 9x2 + -9x2 Combine like terms: 9x2 + -9x2 = 0 -18x = 40 + 0 -18x = 40 Solving -18x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-18'. x = -2.222222222 Simplifying x = -2.222222222
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