Monday Mutant 62: Crowd Nine (equations)

In this Crowd Nine puzzle, all of the outlined equations, when read from left to right or from top to bottom, must be true when the grid is filled in. Perform operations in reading order (for example, 3-1+2 is 4, not 0, and 1+2×3 is 9, not 7). The rules are otherwise unchanged.

This puzzle was written as a response to Mah Boy's puzzle which I reviewed in Grant's Review Corner: Volume 3. While I suspect that someone like motris could create a much better one of these, it does illustrate the concepts which I wanted to get across: the presentation is precise, with the rules and equations being clearly delineated, the givens are symmetrical (which almost never hurts), and the equations interact in different ways (see the overlapping equations in column 9).