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a in (-oo:+oo)
15/35 = a/175 // - a/175
15/35-(a/175) = 0
3/7-1/175*a = 0 // - 3/7
-1/175*a = -3/7 // : -1/175
a = -3/7/(-1/175)
a = 75
a = 75
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