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f in (-oo:+oo)
10 = (3*f)/2-f // - (3*f)/2-f
f-((3*f)/2)+10 = 0
(-3/2)*f+f+10 = 0
10-1/2*f = 0 // - 10
-1/2*f = -10 // : -1/2
f = -10/(-1/2)
f = 20
f = 20
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