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x in (-oo:+oo)
167/56 = x+4*x-(1/7) // - x+4*x-(1/7)
167/56-x-(4*x)+1/7 = 0
167/56-x-4*x+1/7 = 0
25/8-5*x = 0 // - 25/8
-5*x = -25/8 // : -5
x = -25/8/(-5)
x = 5/8
x = 5/8
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