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