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d=1/2*9.8*2.50*2.20
We move all terms to the left:
d-(1/2*9.8*2.50*2.20)=0
We add all the numbers together, and all the variables
d-(+1/2*9.8*2.50*2.20)=0
We get rid of parentheses
d-1/2*9.8*2.50*2.20=0
We multiply all the terms by the denominator
d*2*9.8*2.50*2.20-1=0
Wy multiply elements
107.8d*9-1=0
We move all terms containing d to the left, all other terms to the right
107.8d*9=1
d=1/1
d=1
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