40-2.5r=0.5

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Solution for 40-2.5r=0.5 equation: 



40-2.5r=0.5

We move all terms to the left:

40-2.5r-(0.5)=0

We add all the numbers together, and all the variables

-2.5r+39.5=0

We move all terms containing r to the left, all other terms to the right

-2.5r=-39.5

r=-39.5/-2.5

r=15+1/1.25

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