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128=70+8r
We move all terms to the left:
128-(70+8r)=0
We add all the numbers together, and all the variables
-(8r+70)+128=0
We get rid of parentheses
-8r-70+128=0
We add all the numbers together, and all the variables
-8r+58=0
We move all terms containing r to the left, all other terms to the right
-8r=-58
r=-58/-8
r=7+1/4
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