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x in (-oo:+oo)
5 = (15750/1000)*x // - (15750/1000)*x
5-((15750/1000)*x) = 0
(-63/4)*x+5 = 0
5-63/4*x = 0 // - 5
-63/4*x = -5 // : -63/4
x = -5/(-63/4)
x = 20/63
x = 20/63
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