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There is no visible operator between 3x and 4, for example.
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It can also be written as 3x + 7. The value of the expression will depend on the value of x.
if 3x+7 = 3 then 3x = 3-7 3x = -4 then, x = -4/3
x = 7
The 7 is contant in 3x + 7, and the 3x term is variable depending on the value of x.
7