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x in (-oo:+oo)
12 = (x-4)/0.05 // - (x-4)/0.05
12-((x-4)/0.05) = 0
12-20*(x-4) = 0
12-20*(x-4) = 0
92-20*x = 0
92-20*x = 0
92-20*x = 0 // - 92
-20*x = -92 // : -20
x = -92/(-20)
x = 23/5
x = 23/5
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