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4x - 5 = 7
4x = 7 + 5
x = 12/4
x = 3
4x - 5 = 19
4x = 19 + 5
x = 24/4
x = 6
HP (3,6)
b. 2x + 12 < 3x - 2
2x - 3x < -2 - 12
-x < -14
x < 14
c. 3/4 - 1/2 = 1/3x + 1 1/6
3/4 - 2/4 = 1/3x + 7/6
1/3x = 1/4 - 7/6
1/3x = 3/12 - 14/12
1/3x = -11/12
12x = -33
x = -33/12