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a in (-oo:+oo)
49/98 = a/112 // - a/112
49/98-(a/112) = 0
1/2-1/112*a = 0 // - 1/2
-1/112*a = -1/2 // : -1/112
a = -1/2/(-1/112)
a = 56
a = 56
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