8r-r=7

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Solution for 8r-r=7 equation:



8r-r=7
We move all terms to the left:
8r-r-(7)=0
We add all the numbers together, and all the variables
7r-7=0
We move all terms containing r to the left, all other terms to the right
7r=7
r=7/7
r=1

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