Example

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

Question

$$\displaystyle\sum_{ 4 }^{ 51 } \left(4i-5 \right)$$

Evaluate

$-240+192i$

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