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a in (-oo:+oo)
-11 = (a-5)/6 // - (a-5)/6
-((a-5)/6)-11 = 0
(-1*(a-5))/6-11 = 0
(-1*(a-5))/6+(-11*6)/6 = 0
-1*(a-5)-11*6 = 0
-a-61 = 0
(-a-61)/6 = 0
(-a-61)/6 = 0 // * 6
-a-61 = 0
-a-61 = 0 // + 61
-a = 61 // * -1
a = -61
a = -61
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