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f in (-oo:+oo)
150/4 = (f-32)/4 // - (f-32)/4
150/4-((f-32)/4) = 0
(-1*(f-32))/4+75/2 = 0
(-1*2*(f-32))/(2*4)+(4*75)/(2*4) = 0
4*75-1*2*(f-32) = 0
364-2*f = 0
(364-2*f)/(2*4) = 0
(364-2*f)/(2*4) = 0 // * 2*4
364-2*f = 0
364-2*f = 0 // - 364
-2*f = -364 // : -2
f = -364/(-2)
f = 182
f = 182
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