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a in (-oo:+oo)
a-10 = 3*a-26 // - 3*a-26
a-(3*a)-10+26 = 0
a-3*a-10+26 = 0
16-2*a = 0 // - 16
-2*a = -16 // : -2
a = -16/(-2)
a = 8
a = 8
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