If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
1.96 = a-(64/2.8) // - a-(64/2.8)
64/2.8-a+1.96 = 0
24.81714286-a = 0 // - 24.81714286
-a = -24.81714286 // * -1
a = 24.81714286
a = 24.81714286
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