Example

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

Question

$$(3a-7b-c)^{2}$$

Expand

$9a^{2}-42ab-6ac+49b^{2}+14bc+c^{2}$

Evaluate

$\left(3a-7b-c\right)^{2}$

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