हल करना 9 * (a - b) ^ 2 - (3a - 3b) ^ 2 = | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$9(a-b)^{2}-(3a-3b)^{2}=$$