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x in (-oo:+oo)
3/5 = (7/8)*x // - (7/8)*x
3/5-((7/8)*x) = 0
(-7/8)*x+3/5 = 0
3/5-7/8*x = 0 // - 3/5
-7/8*x = -3/5 // : -7/8
x = -3/5/(-7/8)
x = 24/35
x = 24/35
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