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14d + 20e
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d = 2
It is a linear equation in one unknown, d.
4(9)-11=25 2(9)+7=25 d=9
D + 3D = 240 4D = 240 Divide both sides of the equation by 4: D = 60
1.6-d=12.8+3d 12.8-1.6=-d-3d 11.2=-4d 11.2/-4=d d=-2.8