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43=6r+7
We move all terms to the left:
43-(6r+7)=0
We get rid of parentheses
-6r-7+43=0
We add all the numbers together, and all the variables
-6r+36=0
We move all terms containing r to the left, all other terms to the right
-6r=-36
r=-36/-6
r=+6
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