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x in (-oo:+oo)
-((x-7)/4) = 1 // - 1
-((x-7)/4)-1 = 0
(-1*(x-7))/4-1 = 0
(-1*(x-7))/4+(-1*4)/4 = 0
-1*(x-7)-1*4 = 0
3-x = 0
(3-x)/4 = 0
(3-x)/4 = 0 // * 4
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x = 3
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