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5(4+r)=1/2(40+10)-7
We move all terms to the left:
5(4+r)-(1/2(40+10)-7)=0
We add all the numbers together, and all the variables
5(r+4)-(1/250-7)=0
We multiply parentheses
5r+20-(1/250-7)=0
We get rid of parentheses
5r+20+7-1/250=0
We multiply all the terms by the denominator
5r*250-1+20*250+7*250=0
We add all the numbers together, and all the variables
5r*250+6749=0
Wy multiply elements
1250r+6749=0
We move all terms containing r to the left, all other terms to the right
1250r=-6749
r=-6749/1250
r=-5+499/1250
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