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2x-3x < -7
-x < -7
x < 7
5x-18 < 12
5x < 12+18
5x < 30
x < 6
7. < 3x - 2x
7. < 1x
7. < x
b. 5x -18 < 12
5x. < 12 + 18
5x. < 30
x < 30 : 5
x < 6