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x in (-oo:+oo)
x/(-3) = 5/7 // - 5/7
x/(-3)-(5/7) = 0
x/(-3)-5/7 = 0
-1/3*x-5/7 = 0 // + 5/7
-1/3*x = 5/7 // : -1/3
x = 5/7/(-1/3)
x = -15/7
x = -15/7
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