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a in (-oo:+oo)
9-5*a = 2*a+65 // - 2*a+65
9-5*a-(2*a)-65 = 0
9-5*a-2*a-65 = 0
-7*a-56 = 0 // + 56
-7*a = 56 // : -7
a = 56/(-7)
a = -8
a = -8
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