#### Factorize -20x^2 - 9x + 20

#### Expand and simplify (x + y)^3

#### (a - b)^2 =

#### Simplify 15ax^2 ⁄ 5x

#### Factorize x^2 + x - 72

#### Simplify a(c - b) - b(a - c)

#### Expand and simplify (x - y)(x + y)

#### Simplify 5⁄2 ÷ 1⁄x

#### Coefficient of x^2 in 4x^3 + 3x^2 - x + 1 is:

#### Expand and simplify (x - 5)(x + 4)

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