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3(r-7)=-4
We move all terms to the left:
3(r-7)-(-4)=0
We add all the numbers together, and all the variables
3(r-7)+4=0
We multiply parentheses
3r-21+4=0
We add all the numbers together, and all the variables
3r-17=0
We move all terms containing r to the left, all other terms to the right
3r=17
r=17/3
r=5+2/3
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