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a in (-oo:+oo)
3 = 6*a-5*a+1 // - 6*a-5*a+1
3-(-5*a)-(6*a)-1 = 0
5*a-6*a-1+3 = 0
2-a = 0 // - 2
-a = -2 // * -1
a = 2
a = 2
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