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please can you answer this is all about sums and differences of rational algebraic expression...please i need it please ?this is the problem....3/5+4/5=? another x/3-y/3=? another is 7/a+2/a

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please is there anybody who can help me to do my assignment about sums and differences of a rational... can you answer this please about sums and differences of a rational algebraic expression this is t... x+4/2 - x-1/5 + 2x+5/10 another is 3b/7a - a/2b + 3a^2-2b^2/14ab another is 2x-y/3x+y + 5x/2y this... sums and differences of rational algebraic expression please answer the following 9ab/cd^2 - 7ab/cd...