What impact did Islam have in the Indian subcontinent?

Islam brought to India a conception of human equality, pride in one's religion, a legal system which was in many ways an advance on the codes of the time Hindu rulers were influenced to work as the upholders of Hindu religion.

The Hindus to a great extent have adopted the thoughts and belief of Islam. The impact of Islam on Indian culture has been inestimable. It permanently influenced the development of all areas of human like language, dress, cuisine, all the art forms, architecture and urban design, and social customs and values.

for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

d is the right answer