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x in (-oo:+oo)
1/7-(4*x) = -51/35 // + -51/35
1/7-(4*x)-(-51/35) = 0
1/7-4*x+51/35 = 0
8/5-4*x = 0 // - 8/5
-4*x = -8/5 // : -4
x = -8/5/(-4)
x = 2/5
x = 2/5
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