\[9(2x-3y)\]

1
Expand by distributing terms.
9×2x+9×3y9\times 2x+9\times -3y

2
Simplify  9×2x9\times 2x  to  18x18x.
18x+9×3y18x+9\times -3y

3
Simplify  9×3y9\times -3y  to  27y-27y.
18x27y18x-27y

Done

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