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