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Simplifying (X + -9)(x + 10) = 90 Reorder the terms: (-9 + X)(x + 10) = 90 Reorder the terms: (-9 + X)(10 + x) = 90 Multiply (-9 + X) * (10 + x) (-9(10 + x) + X(10 + x)) = 90 ((10 * -9 + x * -9) + X(10 + x)) = 90 ((-90 + -9x) + X(10 + x)) = 90 (-90 + -9x + (10 * X + x * X)) = 90 (-90 + -9x + (10X + xX)) = 90 Reorder the terms: (-90 + 10X + -9x + xX) = 90 (-90 + 10X + -9x + xX) = 90 Solving -90 + 10X + -9x + xX = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 10X + -9x + 90 + xX = 90 + 90 Reorder the terms: -90 + 90 + 10X + -9x + xX = 90 + 90 Combine like terms: -90 + 90 = 0 0 + 10X + -9x + xX = 90 + 90 10X + -9x + xX = 90 + 90 Combine like terms: 90 + 90 = 180 10X + -9x + xX = 180 Add '9x' to each side of the equation. 10X + -9x + 9x + xX = 180 + 9x Combine like terms: -9x + 9x = 0 10X + 0 + xX = 180 + 9x 10X + xX = 180 + 9x Reorder the terms: -180 + 10X + -9x + xX = 180 + 9x + -180 + -9x Reorder the terms: -180 + 10X + -9x + xX = 180 + -180 + 9x + -9x Combine like terms: 180 + -180 = 0 -180 + 10X + -9x + xX = 0 + 9x + -9x -180 + 10X + -9x + xX = 9x + -9x Combine like terms: 9x + -9x = 0 -180 + 10X + -9x + xX = 0 The solution to this equation could not be determined.
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