The 7 is contant in 3x + 7, and the 3x term is variable depending on the value of x.
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(-3x - 1)(3x - 7)
13x + 7
if 3x+7 = 3 then 3x = 3-7 3x = -4 then, x = -4/3
4x plus 7 plus 3x equals 19 plus xx = 2
In the equation 3x plus 7 equals 13, x is equal to 2.