6*3-6*2-12x
v v
18 - 12-12x
v v
6-24x
-6 -6
something like that..
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x: x2 - 81 = 0
y=±√15
16
4n2-25 = 0 4n2=25 n2=6.25 n=sqrt(6.25) n= +2.5 or -2.5
In order to solve this equation you need to know what -28x-2 equals. If you were to assume it was 0 then x = 0.071 rounded