1.6-d=12.8+3d
12.8-1.6=-d-3d
11.2=-4d
11.2/-4=d
d=-2.8
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8d-3d =65 plus work
So you basically have, (27D-9)+3D = 29+(27D+1) 30D-9 = 27D+30 3D = 39 D = 13
c = 6 and d = 7
D + 3D = 240 4D = 240 Divide both sides of the equation by 4: D = 60
3d-3d cancel 2d-3d=-1d 8=-1d-17 -17+17 cancel 8+17=25 25=-1d 25/-1=-1d/-1 d=-25