r-4.2=3.5

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Solution for r-4.2=3.5 equation: 



r-4.2=3.5

We move all terms to the left:

r-4.2-(3.5)=0

We add all the numbers together, and all the variables

r-7.7=0

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

r=7.7

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