If your talking maths then its 4 d if your talking viewing on a a screen 3d is 3 dimension and d is dimension
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They can be simplified to 10d
1.6-d=12.8+3d 12.8-1.6=-d-3d 11.2=-4d 11.2/-4=d d=-2.8
D + 3D = 240 4D = 240 Divide both sides of the equation by 4: D = 60
3d + 8d - d - 5 = 10d - 5 = 5*(2d - 1)
That depends on the value of d.