As far as I know it's an expression because it doesn't have an equal sign. That's the main difference between expressions and equations.
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3a + 2b is an expression in algebra. If you make 3a + 2b equal to something then you can find the values of "a" and "b" Lets say you make 3a + 2b equal to 23 3a + 2b = 23 Now find "a" and "b" to make this equation true... 3(5) + 2(4) = 23 15 + 8 = 23 23 = 23 Correct So in this case a=5 and b=4
2a + 3a + 4 = 5a + 4
4a + 3a = (4 + 3)a = 7a
a = 3a + 4 0 = 2a + 4 2a = -4 a = -2
2/3a / 4 = 2/3a / 4/1 = 2/3a x 1/4 = 2/12a = 1/6a