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a in (-oo:+oo)
8 = (4*a)/7 // - (4*a)/7
8-((4*a)/7) = 0
(-4/7)*a+8 = 0
8-4/7*a = 0 // - 8
-4/7*a = -8 // : -4/7
a = -8/(-4/7)
a = 14
a = 14
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