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f in (-oo:+oo)
f/6+1.2 = -30 // + 30
f/6+1.2+30 = 0
1/6*f+31.2 = 0 // - 31.2
1/6*f = -31.2 // : 1/6
f = -31.2/1/6
f = -187.19999626
f = -187.19999626
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