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Verified answer

1) 3z/(2z+5y) + (3x+6y)/(2z+5y) = (3z+3x+6y)/(2z+5y) 
2) (6x-3z)/(8x-4z) + (8x+5z)/(8x-4z) = (6x-3z+8x+5z)/(8x-4z) = (14x+2z)/(8x-4z) = (2(7x+z))/(2(4x-2z)) = (7x+z)/(4x-2z) 
3) 3c/2c + (7c-2k)/2c = (3c+7c-2k)/2c = (10c-2k)/2c = (2(5c-k))/2c = (5c-k)/c 

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