If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x = (8/9)*f // - (8/9)*f
x-((8/9)*f) = 0
(-8/9)*f+x = 0
x-8/9*f = 0 // + -8/9*f
x = -(-8/9*f)
x = 8/9*f
x = 8/9*f
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