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