Program to read a single variable equation from json and solve.

Json input: { "op": "equal", "lhs": { "op": "add", "lhs": 1, "rhs": { "op": "multiply", "lhs": "x", "rhs": 10 } }, "rhs": 21 }

Output: Equation: 1 + (x * 10) = 21 x = (21-1)/10 x = 2