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(-2*a-(2*b))/c = a // - a
(-2*a-(2*b))/c-a = 0
(-2*a-2*b)/c-a = 0
(-2*a-2*b)/c+(-a*c)/c = 0
-2*a-2*b-a*c = 0
-2*a-2*b-(a*c) = 0
(-2*a-2*b-(a*c))/c = 0
(-2*a-2*b-(a*c))/c = 0 // * c
-2*a-2*b-(a*c) = 0
x belongs to the empty set
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