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3x-7+4x+1 < -1 = ...?

Răspuns :

[tex]\displaystyle 3x-7+4x+1\ \textless \ -1 \\ 3x+4x\ \textless \ -1+7-1 \\ 7x\ \textless \ 5 \\ x\ \textless \ \frac{5}{7} [/tex]
3x-7+4x+1<-1
7x-6<-1
7x<-1+6
7x<5
x<5/7