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x in (-oo:+oo)
390/35 = 215*x // - 215*x
390/35-(215*x) = 0
390/35-215*x = 0
78/7-215*x = 0 // - 78/7
-215*x = -78/7 // : -215
x = -78/7/(-215)
x = 78/1505
x = 78/1505
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