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c. 2x + 3 - 7x < 9 - x + 6
2x -7x + x < 9 + 6 - 3
-4x < 12
x < 12/-4
x < -3

d. 2 < x + 2 < 6
2 - 2 < x < 6
0 < x < 6

e. -2 (5 - 3x)/2 + 3 < -7/2 + 14x
-10 + 6x/2 + 3 < -7/2 + 14x
semua dikali dengan 2
-10 + 6x + 6 < -7 + 28x
-10 + 6 + 7 < 28x - 6x
3 < 24x
3/24 < x

c. 2x + 3 - 7x < 9 - x + 6
   2x - 7x + x < 9 + 6 - 3
   -4x < 12
   x > 12/-4
   x > -3

d. 2 < x + 2 < 6
    2 - 2 - 6 < x
   -6 < x
    x > -6

e. -2 (5 - 3x)/2 + 3 < -7/2 + 14x
    - (5 - 3x) + 3 < -7/2 + 14x
    -5 - 3x + 3 - 14x < -7/2
    - 3x - 14x < -7/2 + 5 - 3
    -17x < -7/2 + 10/2 - 6/2
    -17x < -3/2
     x > -3/2 ÷ -17
    x > -3/2 ÷ -34/2
    x > -3/2 * -2/34
    x > 3/34