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4+r/5=-1
We move all terms to the left:
4+r/5-(-1)=0
We add all the numbers together, and all the variables
r/5+5=0
We multiply all the terms by the denominator
r+5*5=0
We add all the numbers together, and all the variables
r+25=0
We move all terms containing r to the left, all other terms to the right
r=-25
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