16 = 7f + 2
14 = 7f
2 = f
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f = -2
Evaluating a function called f(x) at f(4) basically means you set x = 4 in f(x) and solve. In other words, you solve the expression for x = 4. In this case: f(x) = 3x + 7f(4) = 3(4) + 7f(4) = 12 + 7f(4) = 19So, if you evaluate this function for f(4), you get 19.
No, it equals -7f.
So if 7F-5=2F+3, you would bring the F's all over to one side and the constants over to the other. 5F=8, then you would divide the 5 over to the other side. So the answer is F=5/8
If you mean: 9f+10f-12f then it is 7f simplified