Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$[(3y-5y)^{2}(2x^{2}y^{3})]:(-\frac{1}{2}xy^{2})^{2}-[20y-(-8y)]$$

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