80=100-r*100

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Solution for 80=100-r*100 equation:



80=100-r*100
We move all terms to the left:
80-(100-r*100)=0
We add all the numbers together, and all the variables
-(-r*100+100)+80=0
We get rid of parentheses
r*100-100+80=0
We add all the numbers together, and all the variables
r*100-20=0
Wy multiply elements
100r-20=0
We move all terms containing r to the left, all other terms to the right
100r=20
r=20/100
r=1/5

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