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a in (-oo:+oo)
16 = 8-7*a-a // - 8-7*a-a
a-(-7*a)-8+16 = 0
7*a+a-8+16 = 0
8*a+8 = 0 // - 8
8*a = -8 // : 8
a = -8/8
a = -1
a = -1
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