how do I find the answer for the equation, d+2d+d, When I don't know the value of d?

I need to simplify the expression, d+2d+d =, But I don't know the value of d? How do I solve this problem without knowing the value of d?
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2 Answers

You do not need to know the value of d.

This is because you are to simplify the given equation, and not solve it.

d + 2d + d is simply 4d when you simplify it.

Hence, the answer is 4d.
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a= 64+25-80cos68º
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