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f in (-oo:+oo)
(f-10)/3 = -6 // + 6
(f-10)/3+6 = 0
(f-10)/3+(3*6)/3 = 0
f+3*6-10 = 0
f+8 = 0
(f+8)/3 = 0
(f+8)/3 = 0 // * 3
f+8 = 0
f+8 = 0 // - 8
f = -8
f = -8
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