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x in (-oo:+oo)
40/550 = 35*x // - 35*x
40/550-(35*x) = 0
40/550-35*x = 0
4/55-35*x = 0 // - 4/55
-35*x = -4/55 // : -35
x = -4/55/(-35)
x = 4/1925
x = 4/1925
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