1) 2а-2a+2b/ab = 2/a
2) 5-9-9-15/y^2 = -13-15/y^2
3) 2y-4y+1/y^2 = -2y+1/y^2
4) 5x+1,2-x+3x+16/x-5 = 8x-3,8+16/x
5) 16-7x/(x^2-8x+16)-x-x^2/(16-8x+x^2) = 16-x-(7x+x^2/16+x^2-8)
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Answers & Comments
1) 2а-2a+2b/ab = 2/a
2) 5-9-9-15/y^2 = -13-15/y^2
3) 2y-4y+1/y^2 = -2y+1/y^2
4) 5x+1,2-x+3x+16/x-5 = 8x-3,8+16/x
5) 16-7x/(x^2-8x+16)-x-x^2/(16-8x+x^2) = 16-x-(7x+x^2/16+x^2-8)