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3a = -12
a = -4
b. kurang jelas soalnya
3a = -20 + 8
3a = -12
a = -12/3
a = -4
b. 3(2x+3)<x-3
6x + 9 < x-3
6x-x < -3-9
5x < -12
x < -12/5
c. 2 x (x-1) < x – 3
2x - 2 < x - 3
2x - x < -3 +2
x < -1