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a in (-oo:+oo)
7*(9-(2*a)) = -7 // + 7
7*(9-(2*a))+7 = 0
7*(9-2*a)+7 = 0
7*(9-2*a)+7 = 0
70-14*a = 0
70-14*a = 0
70-14*a = 0 // - 70
-14*a = -70 // : -14
a = -70/(-14)
a = 5
a = 5
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