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x in (-oo:+oo)
43/301 = x/217 // - x/217
43/301-(x/217) = 0
1/7-1/217*x = 0 // - 1/7
-1/217*x = -1/7 // : -1/217
x = -1/7/(-1/217)
x = 31
x = 31
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