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6(1+8r)+6r=-426
We move all terms to the left:
6(1+8r)+6r-(-426)=0
We add all the numbers together, and all the variables
6(8r+1)+6r-(-426)=0
We add all the numbers together, and all the variables
6r+6(8r+1)+426=0
We multiply parentheses
6r+48r+6+426=0
We add all the numbers together, and all the variables
54r+432=0
We move all terms containing r to the left, all other terms to the right
54r=-432
r=-432/54
r=-8
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