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4r+3=-018
We move all terms to the left:
4r+3-(-018)=0
We add all the numbers together, and all the variables
4r+3-(-18)=0
We add all the numbers together, and all the variables
4r+21=0
We move all terms containing r to the left, all other terms to the right
4r=-21
r=-21/4
r=-5+1/4
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