Simplify the expression

How do you simplify  9y(2y - 1) - 1(1 - 3y) ?

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9y(2y - 1) - 1(1 - 3y)
=  18y² - 9y - 1 + 3y   {used distributive property and removed parentheses}
=  18y² - 6y + 1   {combined like terms}

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