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a)
x/5 - x/2 = - 3
(2x - 5x)/5*2 = - 3
- 3x/10 = - 3
- 3x = - 3(10)
- 3x = - 30
3x = - 30 (-)
3x = 30
x = 30/3
x = 10
............................................................................
b).
x - 1/2 = 2x + 1/3
x - 2x = 1/3 + 1/2
- x = (2 + 3)/3*2
- x = 5/6
x = - 5/6