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.4D+2+90+D+8=180
We move all terms to the left:
.4D+2+90+D+8-(180)=0
We add all the numbers together, and all the variables
1.4D-80=0
We move all terms containing D to the left, all other terms to the right
1.4D=80
D=80/1.4
D=57+0.2/1.4
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