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x in (-oo:+oo)
-7 = 5*x-(2/(-4)) // - 5*x-(2/(-4))
2/(-4)-(5*x)-7 = 0
2/(-4)-5*x-7 = 0
-5*x-15/2 = 0 // + 15/2
-5*x = 15/2 // : -5
x = 15/2/(-5)
x = -3/2
x = -3/2
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