-9x+1=-80 -9x = -81 --> subtract one from both sides x = 9 --> divide both sides by -9 to isolate x Answer: 9

[latex]-9x + 1 = -80 \\ or, -9x = -80 -1 \\ or, -9x = -81 \\ or, x = -81/-9 = 9 \\ Thus, x = 9 [/latex]