Question

An equation with more than one operation is called

Answer 1

An equation with more thena one operations can be also called severall-step equation, because requires multiple operations to be solved.There is a order which operation you should do first. The equation can be solved in several steps an thats why is it not a one-step equation.

Answer 2

An Equation with two operations is known as Two Step Equation, likewise an equation with more than one operations or multiple operations is termed as Multi-Step Equations.

This name is used because in order to solve the equation you have to use multiple steps. For example in an equation involving addition and squaring you have two perform two operations in their correct order to get to the answer. So for multiple operations, you have to perform multiple steps to reach at the answer. 

Most of the equations we deal in Math are multi-step equations.