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x in (-oo:+oo)
-1.645 = (x-55)/4 // - (x-55)/4
-((x-55)/4)-1.645 = 0
(-1*(x-55))/4-1.645 = 0
(-1*(x-55))/4+(-1.645*4)/4 = 0
-1*(x-55)-1.645*4 = 0
48.42-x = 0
(48.42-x)/4 = 0
(48.42-x)/4 = 0 // * 4
48.42-x = 0
48.42-x = 0 // - 48.42
-x = -48.42 // * -1
x = 48.42
x = 48.42
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