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x in (-oo:+oo)
7875 = x-(x/5) // - x-(x/5)
x/5-x+7875 = 0
7875-4/5*x = 0 // - 7875
-4/5*x = -7875 // : -4/5
x = -7875/(-4/5)
x = 39375/4
x = 39375/4
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