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6(1-5r)=126
We move all terms to the left:
6(1-5r)-(126)=0
We add all the numbers together, and all the variables
6(-5r+1)-126=0
We multiply parentheses
-30r+6-126=0
We add all the numbers together, and all the variables
-30r-120=0
We move all terms containing r to the left, all other terms to the right
-30r=120
r=120/-30
r=-4
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