The concept of solving 2-step equations, which involve two arithmetic operations to isolate the variable, is a fundamental concept in algebra. The invention of this method cannot be attributed to a single individual, as algebraic equations have been developed and refined over centuries by mathematicians from various cultures. However, the systematic approach to solving equations, including 2-step equations, can be traced back to ancient civilizations such as the Babylonians, Greeks, and Arabs, who made significant contributions to the field of mathematics.
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The first step is to show the equations which have not been shown.
multi-step equations
Step one is by expressing one of the equation into one term that is taking one unknown in the form of other. Step two is replacing the unknown into equation 2. Step 3 is replacing the found unknown into one of initial equations to find the other unknown.
The first step is to solve one of the equations for one of the variables. This is then substituted into the other equation or equations.
If you mean: 4n-2n = 4 then 2n = 4 and n = 2