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Solve the inequality and find the correct range for [tex]\( x \)[/tex]:

[tex]\[
\frac{1}{3} x + 1 \frac{2}{3} \ \textless \ -\frac{3}{4} x - \frac{1}{2}
\][/tex]


Sagot :

Sure, let's solve the inequality step by step:

We start with the given inequality:
[tex]\[ \frac{1}{3} x + \frac{5}{3} < -\frac{3}{4} x - \frac{1}{2} \][/tex]

First, we want to clear the fractions by finding a common multiple. In this case, the least common multiple (LCM) of the denominators (3 and 4) is 12. We multiply each term by 12:

[tex]\[ 12 \cdot \left( \frac{1}{3}x \right) + 12 \cdot \left( \frac{5}{3} \right) < 12 \cdot \left( -\frac{3}{4}x \right) + 12 \cdot \left( -\frac{1}{2} \right) \][/tex]

This simplifies to:

[tex]\[ 4x + 20 < -9x - 6 \][/tex]

Next, we want to isolate [tex]\( x \)[/tex]. Begin by getting all terms involving [tex]\( x \)[/tex] on one side of the inequality and the constant terms on the other side. To do this, add [tex]\( 9x \)[/tex] to both sides:

[tex]\[ 4x + 9x + 20 < -9x + 9x - 6 \][/tex]

This simplifies to:

[tex]\[ 13x + 20 < -6 \][/tex]

Now, isolate [tex]\( x \)[/tex] by subtracting 20 from both sides:

[tex]\[ 13x + 20 - 20 < -6 - 20 \][/tex]

This simplifies to:

[tex]\[ 13x < -26 \][/tex]

Now, solve for [tex]\( x \)[/tex] by dividing both sides by 13:

[tex]\[ x < -2 \][/tex]

Hence, the solution to the inequality [tex]\(\frac{1}{3} x+ \frac{5}{3} < -\frac{3}{4} x-\frac{1}{2}\)[/tex] is:

[tex]\[ x < -2 \][/tex]

In interval notation, this means:

[tex]\[ (-\infty, -2) \][/tex]