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x in (-oo:+oo)
-1 = (x-50)/5 // - (x-50)/5
-((x-50)/5)-1 = 0
(-1*(x-50))/5-1 = 0
(-1*(x-50))/5+(-1*5)/5 = 0
-1*(x-50)-1*5 = 0
45-x = 0
(45-x)/5 = 0
(45-x)/5 = 0 // * 5
45-x = 0
45-x = 0 // - 45
-x = -45 // * -1
x = 45
x = 45
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