Example

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

Question

$$( a + b - c ) ^ { 2 }$$

Expand

$a^{2}+2ab-2ac+b^{2}-2bc+c^{2}$

Evaluate

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

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