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a in (-oo:+oo)
(4/7)*a+1/8 = 1/8 // - 1/8
(4/7)*a+1/8-(1/8) = 0
(4/7)*a+1/8-1/8 = 0
4/7*a = 0 // : 4/7
a = 0
a = 0
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