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x in (-oo:+oo)
-3 = (x-7)/6 // - (x-7)/6
-((x-7)/6)-3 = 0
(-1*(x-7))/6-3 = 0
(-1*(x-7))/6+(-3*6)/6 = 0
-1*(x-7)-3*6 = 0
-x-11 = 0
(-x-11)/6 = 0
(-x-11)/6 = 0 // * 6
-x-11 = 0
-x-11 = 0 // + 11
-x = 11 // * -1
x = -11
x = -11
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