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2.58-12.5r=-11.6r+18.51
We move all terms to the left:
2.58-12.5r-(-11.6r+18.51)=0
We get rid of parentheses
-12.5r+11.6r-18.51+2.58=0
We add all the numbers together, and all the variables
-0.9r-15.93=0
We move all terms containing r to the left, all other terms to the right
-0.9r=15.93
r=15.93/-0.9
r=-17+0.63/0.9
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