Problem
Highlight the incorrect step:
8x - 7 > 17 + 12x
-4x - 7 > 17
-4x > 24
X > -6
Solution
8x - 7 > 17 + 12x
If we subtract in both sides 12 x we got:
-4x - 7 > 17
If we add 7 in both sides we got
-4x > 24
If we divide both sides of the equation by -4 we got:
x< -6
X > -6 (Mistake we need to change the sign of the inequality when we divide by a negative number)