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a in (-oo:+oo)
7*(1-(1*a)) = 7 // - 7
7*(1-(1*a))-7 = 0
7*(1-a)-7 = 0
7*(1-a)-7 = 0
-7*a = 0
-7*a = 0
-7*a = 0 // : -7
a = 0
a = 0
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