To find out if -1 is a solution for 4x+5<3 we should substitute -1 instead of x: 4(-1)+5<3 -4+5<3 1<3 that's true so -1 is a solution. To find all solutions we should transform initial inequality: 4x+5<3 4x<-5+3 4x<-2 x<-1/2 As you can see, obtained set of solutions contains -1.
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