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16-r/7=-4
We move all terms to the left:
16-r/7-(-4)=0
We add all the numbers together, and all the variables
-r/7+20=0
We multiply all the terms by the denominator
-r+20*7=0
We add all the numbers together, and all the variables
-1r+140=0
We move all terms containing r to the left, all other terms to the right
-r=-140
r=-140/-1
r=+140
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