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3d=(20-d)4
We move all terms to the left:
3d-((20-d)4)=0
We add all the numbers together, and all the variables
3d-((-1d+20)4)=0
We calculate terms in parentheses: -((-1d+20)4), so:We get rid of parentheses
(-1d+20)4
We multiply parentheses
-4d+80
Back to the equation:
-(-4d+80)
3d+4d-80=0
We add all the numbers together, and all the variables
7d-80=0
We move all terms containing d to the left, all other terms to the right
7d=80
d=80/7
d=11+3/7
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