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x in (-oo:+oo)
x/(-5) = 2/7 // - 2/7
x/(-5)-(2/7) = 0
x/(-5)-2/7 = 0
-1/5*x-2/7 = 0 // + 2/7
-1/5*x = 2/7 // : -1/5
x = 2/7/(-1/5)
x = -10/7
x = -10/7
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