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a. 3x-2 < 7
3x < 7+2
3x < 9
x < 3
b. x+4 <_ 7-2x
x+2x <_ 7-4
3x <_ 3
x <_ 1
c. 6+x _> x+10
x-x _> 10-6
0 _> 4
d. 3(x+2) < 12
3x+6 < 12
3x < 12-6
3x < 6
x < 2