-x < 3
To solve we must divide both sides by -1 to find the solution
In inequality when we divide both side or multiply both sides by a negative number we must reverse the sign of inequality, why that
2 > 1
If we multiply both sides by -1, it will be
-2> -1, which is wrong so we must reverse the sign of inequality to be
-2 < -1
So when we multiply the inequality above by -1, we must reverse the sign of inequality
