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x in (-oo:+oo)
-4 = 7*x+1/8 // - 7*x+1/8
-(7*x)-(1/8)-4 = 0
-7*x-1/8-4 = 0
-7*x-33/8 = 0 // + 33/8
-7*x = 33/8 // : -7
x = 33/8/(-7)
x = -33/56
x = -33/56
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