r+0.8=7.8

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Solution for r+0.8=7.8 equation: 



r+0.8=7.8

We move all terms to the left:

r+0.8-(7.8)=0

We add all the numbers together, and all the variables

r-7=0

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

r=7

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