
This image was generated from input here: https://cortexjs.io/compute-engine/demo/
with: $$ 7\times\left(\sum_{i=1}^{25}\frac{i-1}{10}\right)+1 $$ and $$ 7\times\sum_{i=1}^{25}\frac{i-1}{10}+1 $$
Both of the sums in the image should evaluate to 211. Implied parentheses for summation are ignored.
NOTE working instance of implied parentheses: $$ \cos3+1 $$ evaluates same as $$ 1 + \cos(3) $$