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Simplifying -9(x + 9) = 90 Reorder the terms: -9(9 + x) = 90 (9 * -9 + x * -9) = 90 (-81 + -9x) = 90 Solving -81 + -9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + -9x = 90 + 81 Combine like terms: -81 + 81 = 0 0 + -9x = 90 + 81 -9x = 90 + 81 Combine like terms: 90 + 81 = 171 -9x = 171 Divide each side by '-9'. x = -19 Simplifying x = -19
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