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7(d+4)-5(d-2)/2=20.5
We move all terms to the left:
7(d+4)-5(d-2)/2-(20.5)=0
We add all the numbers together, and all the variables
7(d+4)-5(d-2)/2-20.5=0
We multiply parentheses
7d-5(d-2)/2+28-20.5=0
We multiply all the terms by the denominator
7d*2-5(d-2)+28*2-(20.5)*2=0
We add all the numbers together, and all the variables
7d*2-5(d-2)+15=0
We multiply parentheses
7d*2-5d+10+15=0
Wy multiply elements
14d-5d+10+15=0
We add all the numbers together, and all the variables
9d+25=0
We move all terms containing d to the left, all other terms to the right
9d=-25
d=-25/9
d=-2+7/9
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