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a in (-oo:+oo)
9-4*a = 6*a+49 // - 6*a+49
9-4*a-(6*a)-49 = 0
9-4*a-6*a-49 = 0
-10*a-40 = 0 // + 40
-10*a = 40 // : -10
a = 40/(-10)
a = -4
a = -4
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