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70=r/7+63
We move all terms to the left:
70-(r/7+63)=0
We get rid of parentheses
-r/7-63+70=0
We multiply all the terms by the denominator
-r-63*7+70*7=0
We add all the numbers together, and all the variables
-1r+49=0
We move all terms containing r to the left, all other terms to the right
-r=-49
r=-49/-1
r=+49
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