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a in (-oo:+oo)
2*a+4 = 5*a-11 // - 5*a-11
2*a-(5*a)+4+11 = 0
2*a-5*a+4+11 = 0
15-3*a = 0 // - 15
-3*a = -15 // : -3
a = -15/(-3)
a = 5
a = 5
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