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X in (-oo:+oo)
3*X-(9*X)+8/10-(9/14) = 31*X+4*X-(4/14)-(1/35) // - 31*X+4*X-(4/14)-(1/35)
3*X-(9*X)-(31*X)-(4*X)+8/10-(9/14)+4/14+1/35 = 0
3*X-9*X-31*X-4*X+8/10-9/14+4/14+1/35 = 0
33/70-41*X = 0 // - 33/70
-41*X = -33/70 // : -41
X = -33/70/(-41)
X = 33/2870
X = 33/2870
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