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Revision exercise on algebraic expressions

Answer Text:
Revision exercise on algebraic expressions:
1. Simplify 5x + 3y –x +2y.

2. Evaluate; `(x^3 +y)/(2a + by)` Given that x =2,y=3,a=5 and b=-4.

3. Simplify the expression:
`(x - 1)/x - (2x + 1)/(3x)`