The solution for the inequality is x < 20.
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We're given the inequality 
 . And to solve the inequality, I am going to isolate x on the left side of the inequality.
. And to solve the inequality, I am going to isolate x on the left side of the inequality.
And to isolate x, I'll multiply both sides by 4, like this :
⇒ 

⇒ 

∴ x < 20