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a solution
An open number sentence is a sentence which contains a variable. A variable is a unknown number but replaced with a letter and can be on either side of an equals sign.
3x + 8 = 4x + 23x - 4x = 2 - 8-x = -6x = 6
You need to clarify the function AND provide an interval.
an open circle on a number line means the answer is just less than or greater than (< or >), but a closed circle means the answer is less than or equal to, or greater than or equal to (< or > with a line under it)