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5(4+r)=1/2(40+10)
We move all terms to the left:
5(4+r)-(1/2(40+10))=0
We add all the numbers together, and all the variables
5(r+4)-(1/250)=0
We multiply parentheses
5r+20-(1/250)=0
We get rid of parentheses
5r+20-1/250=0
We multiply all the terms by the denominator
5r*250-1+20*250=0
We add all the numbers together, and all the variables
5r*250+4999=0
Wy multiply elements
1250r+4999=0
We move all terms containing r to the left, all other terms to the right
1250r=-4999
r=-4999/1250
r=-3+1249/1250
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