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)
(3/4)*f = -0.75 // + 0.75
(3/4)*f+0.75 = 0
3/4*f+0.75 = 0 // - 0.75
3/4*f = -0.75 // : 3/4
f = -0.75/3/4
f = -1
f = -1
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