If you mean: 4n-2n = 4 then 2n = 4 and n = 2
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To solve a system of equations, you need equations (number phrases with equal signs).
three things: 1) that the value of 4 is equal to the value of 4. 2) you did not obtain any revealing information. 3) your strategy for solving that system of equations was not good.
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Without any equality signs the given terms can't be considered to be equations