solve an equation的用法和样例：
- Gauss rejoined that he had reduced the problem to solving an equation of lower degree.
- You could write an equation for a process that you could actually solve.
- An equation or inequality relating the variables in an optimization problem.
- One side of an equation must balance the other.
- Or worry, but know that worrying is as effective as trying to solve an algebra equation by chewing bubble gum.
- Criteria for using an equation of state.