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f in (-oo:+oo)
f/6+1.2 = 30 // - 30
f/6-30+1.2 = 0
1/6*f-28.8 = 0 // + 28.8
1/6*f = 28.8 // : 1/6
f = 28.8/1/6
f = 172.79999654
f = 172.79999654
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