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a in (-oo:+oo)
-160 = (5/8)*a-410 // - (5/8)*a-410
410-((5/8)*a)-160 = 0
(-5/8)*a-160+410 = 0
250-5/8*a = 0 // - 250
-5/8*a = -250 // : -5/8
a = -250/(-5/8)
a = 400
a = 400
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