#C14: Equation Paths

 made between 4/19/23 and 4/27/23, with a clarity update to the rules and the replacement of a nonunique puzzle on 1/10/25

Each zero starts a number path, which will be defined as a sequence of consecutively increasing whole numbers where each pair of consecutive numbers in the path is orthogonally adjacent in the grid. (In other words, the numbers count up like pedometers, stepping left, right, up, and down.) Paths cannot branch, cross, or overlap other numbers and symbols. Every non-number symbol must be part of at least one valid equation. Equations can read right or down and must start and stop at either an empty space or the grid edge. = cannot be part of any incorrect equation, but unfinished equations (which don't have a number immediately on one side of the =) are allowed. Every path must end within an equation.