Solving equations and inequalities: Linear inequalities in one unknown
Reduction to a linear inequality
In some cases, you can reduce complicated inequalities to linear inequalities.
We note first that division by zero is not allowed and that for this reason \(5x+7\) may not be equal to zero and that therefore \(x=-{{7}\over{5}}\) is not a solution.
We now distinguish two cases, namely \(5x+7>0\) and \(5x+7<0\).
In both cases we multiply the inequality on both sides by \(5x+7\) because we then get a linear inequality, for which we know there is a solution method.
Suppose \(5x+7>0\), i.e. \(x> -{{7}\over{5}}\). Then we get \(5<-4(5x+7)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(20x<-33\).
Then, dvision by the coefficient of \(x\)gives \(x < -{{33}\over{20}}\).
So we have the following system of inequalities: \(x> -{{7}\over{5}}\,\wedge\; x < -{{33}\over{20}}\)
and this simplifies to \(\text{an empty solution set}\).
Suppose \(5x+7<0\), i.e. \(x< -{{7}\over{5}}\). Then we get \(5>-4(5x+7)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(20x>-33\).
Then, division by the coefficient of \(x\) gives \(x > -{{33}\over{20}}\).
So we have the following system of inequalities: \(x< -{{7}\over{5}}\,\wedge\; x > -{{33}\over{20}}\)
and this simplifies to \(-{{33}\over{20}}\lt x\lt -{{7}\over{5}}\).
The solution of the original inequality is \(-{{33}\over{20}}\lt x\lt -{{7}\over{5}}\).