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4(r+20)=1/5(20+400)
We move all terms to the left:
4(r+20)-(1/5(20+400))=0
We add all the numbers together, and all the variables
4(r+20)-(1/5420)=0
We multiply parentheses
4r+80-(1/5420)=0
We get rid of parentheses
4r+80-1/5420=0
We multiply all the terms by the denominator
4r*5420-1+80*5420=0
We add all the numbers together, and all the variables
4r*5420+433599=0
Wy multiply elements
21680r+433599=0
We move all terms containing r to the left, all other terms to the right
21680r=-433599
r=-433599/21680
r=-19+21679/21680
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