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-7(8r-5)=-413
We move all terms to the left:
-7(8r-5)-(-413)=0
We add all the numbers together, and all the variables
-7(8r-5)+413=0
We multiply parentheses
-56r+35+413=0
We add all the numbers together, and all the variables
-56r+448=0
We move all terms containing r to the left, all other terms to the right
-56r=-448
r=-448/-56
r=+8
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