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4(2r-1)=-2(3+16)
We move all terms to the left:
4(2r-1)-(-2(3+16))=0
We add all the numbers together, and all the variables
4(2r-1)-(-219)=0
We add all the numbers together, and all the variables
4(2r-1)+219=0
We multiply parentheses
8r-4+219=0
We add all the numbers together, and all the variables
8r+215=0
We move all terms containing r to the left, all other terms to the right
8r=-215
r=-215/8
r=-26+7/8
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