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 \(8x+7\) may not be equal to zero and that therefore \(x=-{{7}\over{8}}\) is not a solution.
We now distinguish two cases, namely \(8x+7>0\) and \(8x+7<0\).
In both cases we multiply the inequality on both sides by \(8x+7\) because we then get a linear inequality, for which we know there is a solution method.
Suppose \(8x+7>0\), i.e. \(x> -{{7}\over{8}}\). Then we get \(5<4(8x+7)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(-32x<23\).
Then, dvision by the coefficient of \(x\)gives \(x > -{{23}\over{32}}\).
So we have the following system of inequalities: \(x> -{{7}\over{8}}\,\wedge\; x > -{{23}\over{32}}\)
and this simplifies to \(x\gt-{{23}\over{32}}\).
Suppose \(8x+7<0\), i.e. \(x< -{{7}\over{8}}\). Then we get \(5>4(8x+7)\).
When we move everything with \(x\) to the left and all constant terms to the right, we get \(-32x>23\).
Then, division by the coefficient of \(x\) gives \(x < -{{23}\over{32}}\).
So we have the following system of inequalities: \(x< -{{7}\over{8}}\,\wedge\; x < -{{23}\over{32}}\)
and this simplifies to \(x\lt -{{7}\over{8}}\).
The solution of the original inequality is \(x\lt -{{7}\over{8}}\;\vee\;x\gt-{{23}\over{32}}\).