3r-7=8

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Solution for 3r-7=8 equation:



3r-7=8
We move all terms to the left:
3r-7-(8)=0
We add all the numbers together, and all the variables
3r-15=0
We move all terms containing r to the left, all other terms to the right
3r=15
r=15/3
r=5

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