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6a-2a< 7+3
4a<10 |:4
a<10/4
b) 7<6a-3+2a
7+3<8a
10<8a |:8
10/8<a
c) 2a< 6a-3+7
2a-6a<4
-4a<4 |:-4
a>-1
6a-2a<7+3
4a<10
a<10/4=2 1/2
b) 7<6a-3+2a
7+3<6a+2a
8a>10
a>10/8= 1 2/8= 1 1/4
c) 2a<6a-3+7
2a-6a<-3+7
-4a<5 || *(-1)
4a>-5
a>-5/4= -1 1/4