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112.84=-5.2r
We move all terms to the left:
112.84-(-5.2r)=0
We get rid of parentheses
5.2r+112.84=0
We move all terms containing r to the left, all other terms to the right
5.2r=-112.84
r=-112.84/5.2
r=-21+2.219512195122/3.1707317073171
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