If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
2.1/1.4 = f // - f
2.1/1.4-f = 0
1.5-f = 0 // - 1.5
-f = -1.5 // * -1
f = 1.5
f = 1.5
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