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a in (-oo:+oo)
2*a+1 = 7*a+46 // - 7*a+46
2*a-(7*a)-46+1 = 0
2*a-7*a-46+1 = 0
-5*a-45 = 0 // + 45
-5*a = 45 // : -5
a = 45/(-5)
a = -9
a = -9
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