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a in (-oo:+oo)
44 = 8-7*a-(5*a) // - 8-7*a-(5*a)
5*a-(-7*a)-8+44 = 0
7*a+5*a-8+44 = 0
12*a+36 = 0 // - 36
12*a = -36 // : 12
a = -36/12
a = -3
a = -3
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