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x in (-oo:+oo)
-4 = 7*x+1/(-8) // - 7*x+1/(-8)
-(7*x)-(1/(-8))-4 = 0
1/8-7*x-4 = 0
-7*x-31/8 = 0 // + 31/8
-7*x = 31/8 // : -7
x = 31/8/(-7)
x = -31/56
x = -31/56
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