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a in (-oo:+oo)
4*a+7 = 5*a+11 // - 5*a+11
4*a-(5*a)-11+7 = 0
4*a-5*a-11+7 = 0
-a-4 = 0 // + 4
-a = 4 // * -1
a = -4
a = -4
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