It is (4f + 1)/10.
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25 - 13f = -14 25 - 13f = -14 -25 -25 =0 = -39 -13f = -39 -13/-13 = 1 -39/-13 = 3 f = 3
You've given the answer yourself. d=6 and f=3.
If: df+10f = 3 Then: f(d+10) = 3 And: d = 3/f -10
The idea is to replace every "x" by "3", and then do the calculations.
20 equals Y that RVWS