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a in (-oo:+oo)
6-4*a = 4*a-26 // - 4*a-26
6-4*a-(4*a)+26 = 0
6-4*a-4*a+26 = 0
32-8*a = 0 // - 32
-8*a = -32 // : -8
a = -32/(-8)
a = 4
a = 4
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