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x in (-oo:+oo)
5*x-(17/(-4)) = -7 // + 7
5*x-(17/(-4))+7 = 0
5*x+17/4+7 = 0
5*x+45/4 = 0 // - 45/4
5*x = -45/4 // : 5
x = -45/4/5
x = -9/4
x = -9/4
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