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a=1/2(20)(5)
We move all terms to the left:
a-(1/2(20)(5))=0
We add all the numbers together, and all the variables
a-(+1/2205)=0
We get rid of parentheses
a-1/2205=0
We multiply all the terms by the denominator
a*2205-1=0
Wy multiply elements
2205a-1=0
We move all terms containing a to the left, all other terms to the right
2205a=1
a=1/2205
a=1/2205
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