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f in (-oo:+oo)
f/6+1.2 = -77 // + 77
f/6+1.2+77 = 0
1/6*f+78.2 = 0 // - 78.2
1/6*f = -78.2 // : 1/6
f = -78.2/1/6
f = -469.19999062
f = -469.19999062
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