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6(-4r+2)-2r=142
We move all terms to the left:
6(-4r+2)-2r-(142)=0
We add all the numbers together, and all the variables
-2r+6(-4r+2)-142=0
We multiply parentheses
-2r-24r+12-142=0
We add all the numbers together, and all the variables
-26r-130=0
We move all terms containing r to the left, all other terms to the right
-26r=130
r=130/-26
r=-5
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