Example

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

Question

$$( c ) \sum _ { i = 1 } ^ { 6 } 2 ^ { i - 1 }$$

Evaluate

$63c$

Differentiate w.r.t. c

$63$

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